Calibration Tubes

Calibration Tubes Market Outlook

The global calibration tubes market is projected to reach approximately USD 1.20 billion by 2035, with a compound annual growth rate (CAGR) of around 6.5% during the forecast period of 2025 to 2035. This growth is primarily driven by the increasing demand for precise and accurate measurement tools across various industries, including industrial calibration, medical calibration, and automotive sectors. Furthermore, the expansion of laboratories and research facilities globally is expected to boost the need for calibration tubes, as they are essential for ensuring the accuracy of measurements in scientific experiments. Rapid technological advancements and the introduction of innovative products in the calibration sector are also contributing factors to the market's growth. Increasing awareness regarding quality assurance and compliance with international standards will further fuel the calibration tubes market's expansion.

Growth Factor of the Market

Several key factors are driving the growth of the calibration tubes market, notably the soaring demand for precision instruments in industries such as healthcare and manufacturing. As industries increasingly focus on quality control and regulatory compliance, the necessity for calibration tubes to maintain accuracy in measurements has surged. Additionally, the rise of automation and advanced manufacturing technologies necessitates reliable calibration tools, further propelling market growth. The growing trend of laboratory automation and the need for consistent calibration practices are also pivotal elements driving demand. Moreover, continuous advancements in calibration technologies, including the development of digital calibration solutions, are expected to enhance the effectiveness of calibration tubes, thus boosting their uptake in various applications.

Key Highlights of the Market

• The global calibration tubes market is expected to witness a CAGR of 6.5% from 2025 to 2035.
• Increased adoption of calibration tubes in medical and automotive applications enhances market growth.
• Technological advancements in calibration methods are driving demand for innovative calibration solutions.
• Online distribution channels are witnessing a rapid increase in sales due to convenience and broader reach.
• The increasing focus on quality assurance in manufacturing sectors is propelling the calibration tubes market.

By Product Type

Glass Calibration Tubes:

Glass calibration tubes are highly regarded for their durability and chemical resistance, making them a preferred choice in various applications, including laboratory settings. Their ability to provide precise measurements and withstand high temperatures adds to their appeal in critical calibration processes. Furthermore, glass calibration tubes are often favored for their transparency, allowing for easy visualization of the contained substances. As laboratories and industrial facilities increasingly prioritize accuracy and reliability, the demand for glass calibration tubes is anticipated to grow significantly. Their widespread use in scientific research, quality control, and environmental monitoring further reinforces their importance in the calibration tubes market.

Plastic Calibration Tubes:

Plastic calibration tubes are gaining traction due to their lightweight and cost-effective nature, which makes them suitable for various applications. They are particularly popular in environments where breakage is a concern, such as field testing or mobile laboratories. The versatility of plastic materials, including polypropylene and PTFE, allows for customization in shapes and sizes, catering to specific calibration needs. Additionally, plastic calibration tubes exhibit excellent resistance to chemicals, which can be beneficial in various industrial settings. As organizations focus on reducing costs while maintaining quality, the adoption of plastic calibration tubes is expected to rise.

Metal Calibration Tubes:

Metal calibration tubes, often made from stainless steel or aluminum, are recognized for their strength and resilience. These tubes are ideal for high-pressure and high-temperature applications, making them essential in sectors like automotive calibration and industrial calibration. Their ability to maintain structural integrity under extreme conditions enhances their reliability, which is crucial for precision measurements. As industries continue to evolve, the demand for durable and robust calibration solutions will likely increase, further boosting the market for metal calibration tubes.

Silicone Calibration Tubes:

Silicone calibration tubes are known for their flexibility and resistance to extreme temperatures, making them suitable for applications requiring adaptability and reliability. These tubes are particularly useful in laboratory settings where precise fluid movement is critical. The biocompatibility of silicone materials also makes them a popular choice in medical applications, where hygiene and safety are paramount. As the demand for versatile and high-performance calibration solutions grows, silicone calibration tubes are expected to see increased adoption across various industries.

Ceramic Calibration Tubes:

Ceramic calibration tubes are characterized by their high thermal resistance and excellent stability, making them suitable for demanding environments. These tubes offer exceptional durability and are often employed in applications requiring high precision and reliability, such as in scientific research and high-tech industries. The inert nature of ceramics ensures that they do not react with most chemicals, enhancing their usability in diverse settings. As industries prioritize superior performance metrics and consistency, the demand for ceramic calibration tubes is projected to rise in the coming years.

By Application

Industrial Calibration:

Industrial calibration is one of the primary applications of calibration tubes, as they play a crucial role in maintaining the accuracy of instruments used in manufacturing and production processes. Calibration tubes are utilized in various industrial equipment, including pressure gauges, flow meters, and temperature sensors, to ensure these instruments deliver precise measurements. The rising need for quality control and adherence to regulatory standards in manufacturing sectors drives the demand for calibration tubes used in industrial calibration. As industries continue to expand and automate, the importance of reliable calibration solutions will remain pivotal.

Laboratory Calibration:

Laboratory calibration utilizes calibration tubes extensively to ensure the precision of analytical instruments and equipment. Calibration tubes are essential for measuring and controlling experimental variables, contributing to the validity of scientific research. The growing number of research laboratories and quality assurance facilities worldwide reinforces the demand for calibration tubes tailored for laboratory applications. As laboratory practices advance and the need for accurate data intensifies, the market for laboratory calibration tubes is expected to witness significant growth.

Medical Calibration:

Medical calibration is another critical application of calibration tubes, where precise measurements are vital for patient safety and treatment efficacy. Calibration tubes are used in medical devices such as blood analyzers, infusion pumps, and diagnostic equipment to ensure accurate readings. The increasing emphasis on patient care and the growing prevalence of chronic diseases drive the demand for reliable calibration solutions in the healthcare sector. As advancements in medical technology continue to evolve, the reliance on calibration tubes for accurate measurements will only increase.

Environmental Calibration:

Environmental calibration involves using calibration tubes to ensure the accuracy of instruments measuring environmental parameters such as air quality, water quality, and soil conditions. The rising awareness of environmental issues and the implementation of stricter regulations concerning pollution and resource management bolster the demand for calibration tubes in this application area. As environmental monitoring becomes increasingly crucial for sustainable development, the need for accurate calibration solutions will continue to grow.

Automotive Calibration:

Automotive calibration has emerged as a significant application area for calibration tubes, particularly in ensuring the precision of instruments used in vehicle diagnostics and performance testing. Calibration tubes are vital in tuning engines, measuring emissions, and testing fuel efficiency, contributing to the automotive industry's push towards enhanced performance and sustainability. The growing automotive market, coupled with stringent regulatory requirements, is expected to drive the demand for calibration tubes in this sector, as manufacturers prioritize quality and compliance.

By Distribution Channel

Online Stores:

Online stores are rapidly becoming a preferred distribution channel for calibration tubes, as consumers increasingly seek convenience and accessibility. The proliferation of e-commerce platforms allows manufacturers and distributors to reach a wider audience, facilitating the sale of calibration tubes to various sectors, including industrial, laboratory, and medical fields. Online platforms often provide comprehensive product information and customer reviews, aiding buyers in making informed purchasing decisions. As the trend towards online shopping continues to grow, the share of calibration tubes sold through this channel is expected to increase significantly.

Specialty Stores:

Specialty stores cater to specific market segments and provide a focused range of calibration tubes tailored to various industries. Customers visiting specialty stores often seek expert advice and technical support, enhancing their purchasing experience. These stores typically carry high-quality products, ensuring that calibration tubes meet industry-specific standards. As industries evolve and demand specialized solutions, the importance of specialty stores in the calibration tubes market will remain significant, as they provide essential support to customers.

Direct Sales:

Direct sales involve manufacturers selling calibration tubes directly to end-users, which allows for better control over pricing and customer relations. This channel often fosters strong relationships between manufacturers and clients, ensuring that customer needs and preferences are met. Direct sales are particularly beneficial for large organizations requiring bulk orders, as it simplifies the procurement process and often results in cost savings. As competition intensifies within the calibration tubes market, the direct sales model is expected to maintain its relevance, especially for companies focused on delivering tailored solutions.

Wholesalers/Distributors:

Wholesalers and distributors play a crucial role in the calibration tubes market by acting as intermediaries between manufacturers and end-users. They often have established networks and logistics capabilities, enabling them to efficiently handle large volumes of products. By purchasing calibration tubes in bulk from manufacturers, wholesalers and distributors can offer competitive pricing to customers across various industries. As businesses continue to seek cost-effective solutions, the role of wholesalers and distributors in the calibration tubes market will remain vital, contributing to overall market growth.

Others:

This category encompasses various alternative distribution channels, including trade shows, exhibitions, and specialized procurement agencies. These channels provide opportunities for manufacturers to showcase their calibration tubes to potential customers and create awareness about their product offerings. Events such as trade shows allow for direct interaction between producers and buyers, facilitating networking and potential partnerships. As businesses seek innovative ways to connect with customers, these alternative channels are expected to provide unique opportunities for growth within the calibration tubes market.

By Material Type

Borosilicate Glass:

Borosilicate glass is a widely used material in the production of calibration tubes due to its excellent thermal and chemical resistance. This type of glass can withstand temperature fluctuations and is often utilized in laboratory and industrial applications where precise measurements are critical. The transparency of borosilicate glass allows for easy visualization of liquids, further accentuating its utility in various calibration processes. As laboratories and industries prioritize accuracy and reliability, the demand for borosilicate glass calibration tubes is expected to persist.

Stainless Steel:

Stainless steel is a favored material for calibration tubes that require high durability and resistance to corrosion. Its strength makes it ideal for high-pressure applications, while its smooth surface ensures minimal contamination in calibration processes. Stainless steel calibration tubes are commonly used in the automotive and industrial sectors, where precision is essential. As the demand for robust and reliable calibration solutions continues to grow, the use of stainless steel calibration tubes is anticipated to increase.

Polypropylene:

Polypropylene calibration tubes offer a lightweight and cost-effective solution for various applications, particularly in environmental and laboratory calibration. They are resistant to many chemicals and can be produced in various shapes and sizes to suit specific calibration needs. The versatility of polypropylene makes it an attractive option for organizations seeking to balance quality with cost-efficiency. As industries increasingly adopt flexible solutions, the use of polypropylene calibration tubes is likely to grow.

PTFE:

PTFE (polytetrafluoroethylene) calibration tubes are recognized for their exceptional chemical resistance and low friction properties. These tubes are particularly useful in applications involving corrosive substances and are commonly used in laboratory environments. PTFE calibration tubes help ensure accuracy in measurements while minimizing contamination risks. As organizations place greater emphasis on precision and reliability, the adoption of PTFE calibration tubes is expected to rise in various sectors.

Aluminum:

Aluminum calibration tubes are lightweight yet strong, making them suitable for various calibration applications, especially where weight is a concern. Their resistance to corrosion and ease of fabrication further enhance their appeal in industrial and laboratory environments. Aluminum calibration tubes are often utilized in automotive and environmental calibration applications, where precise measurements are critical. As industries evolve and the demand for adaptable solutions grows, the use of aluminum calibration tubes is anticipated to increase.

By Region

North America is expected to dominate the calibration tubes market, accounting for approximately 35% of the global market share by 2035, driven by the presence of advanced manufacturing facilities and a robust healthcare system. The region's emphasis on quality control and compliance with regulatory standards further propels the demand for calibration tubes across various applications, including industrial, laboratory, and medical calibration. The CAGR for the North American market is projected to be around 6.2%, reflecting steady growth in calibration tube adoption in line with technological advancements and increasing end-user awareness.

Europe is also poised to maintain a significant share of the calibration tubes market, accounting for around 30% by 2035. The region's focus on environmental sustainability and stringent regulations governing quality assurance in manufacturing contribute to the growing demand for calibration solutions. Countries such as Germany and the UK are leading the market, with a strong emphasis on research and development initiatives in calibration technologies. The European market is expected to experience a CAGR of approximately 6.4%, fueled by advancements in calibration practices and increasing investments in laboratory infrastructure.

Opportunities

The calibration tubes market is ripe with opportunities as industries increasingly recognize the importance of precision and accuracy in their operations. With the rapid advancement of technology, there is a growing need for innovative calibration solutions that can adapt to evolving industry requirements. Manufacturers are in a prime position to develop advanced calibration tubes that integrate digital technologies, enabling real-time monitoring and enhanced accuracy in measurements. Additionally, the expansion of research and development activities in various sectors, including healthcare, manufacturing, and environmental monitoring, presents a significant opportunity for the calibration tubes market. As organizations seek to enhance their operational efficiency and compliance with standards, the demand for high-quality calibration tubes will continue to grow. Furthermore, emerging markets in Asia Pacific and Latin America offer vast potential for expansion, as industries in these regions increasingly adopt advanced calibration solutions.

Moreover, the growing trend towards sustainability presents additional opportunities for the calibration tubes market. As industries prioritize eco-friendly practices and aim to reduce their environmental impact, there is a rising demand for calibration tubes made from recyclable and sustainable materials. Manufacturers can capitalize on this trend by developing products that align with sustainability goals while maintaining high performance standards. Similarly, the increasing emphasis on automation and digitization in industries opens avenues for the integration of smart calibration tubes that can provide data analytics and insights, further enhancing their value proposition. Overall, the combination of technological advancements, evolving industry demands, and growing sustainability trends creates a favorable landscape for opportunities in the calibration tubes market.

Threats

The calibration tubes market, while poised for growth, is not without its threats. One significant challenge facing the market is the intense competition among manufacturers, which can lead to price wars and reduced profit margins. As more players enter the market, the struggle to differentiate products becomes crucial, and companies may be compelled to lower prices to attract customers. This situation can result in a decrease in product quality and innovation, potentially undermining industry standards. Additionally, fluctuations in raw material prices can impact manufacturing costs, creating uncertainties for producers in sustaining profitability. Furthermore, the rapid pace of technological advancements necessitates continuous investment in research and development, posing financial challenges for smaller players who may lack the resources to keep up with industry leaders.

Another threat to the calibration tubes market is the potential for regulatory changes that may affect manufacturing processes and product specifications. As industries increasingly focus on quality assurance and compliance, any changes in regulations could lead to increased costs for manufacturers as they adapt to new standards. Additionally, the global shift towards digitization and automation presents a challenge for traditional manufacturers that may struggle to integrate advanced technologies into their operations. The evolving landscape of calibration methods and practices could lead to a decline in demand for conventional calibration tubes if they fail to meet modern requirements. Therefore, manufacturers must remain agile and responsive to market shifts to navigate these threats effectively.

Competitor Outlook

• Fluke Corporation
• Keysight Technologies, Inc.
• Tektronix, Inc.
• OMEGA Engineering, Inc.
• PCE Instruments
• Micro Precision Calibration Inc.
• National Instruments Corporation
• Extech Instruments
• GMC-I Instrumentation
• WIKA Instrument, LP
• Ametek, Inc.
• Marathon Sensors
• Accu-Labs
• Testo SE & Co. KGaA
• Industrial Scientific Corporation

The competitive landscape of the calibration tubes market is characterized by a mix of established players and emerging companies striving to capture market share. Leading manufacturers such as Fluke Corporation and Keysight Technologies leverage their extensive expertise in measurement and calibration technologies to offer high-quality calibration tubes tailored to various applications. These companies often invest heavily in research and development to innovate and enhance their product offerings, ensuring they remain at the forefront of the industry. Additionally, they capitalize on their established distribution networks to reach a wide customer base and maintain strong relationships with end-users. The presence of these well-known brands creates a competitive environment, driving other players to enhance their product quality and service capabilities.

Emerging companies in the calibration tubes market are also making their mark by focusing on niche segments and developing specialized products that cater to specific industry needs. These companies often emphasize agility and responsiveness to market demands, allowing them to provide tailored solutions that differentiate them from larger competitors. As the market continues to evolve, partnerships and collaborations between manufacturers, distributors, and end-users will play a crucial role in fostering innovation and ensuring that calibration tubes meet the diverse requirements of various applications. Additionally, newer entrants are increasingly adopting digital strategies to promote their products, utilizing online platforms to enhance visibility and accessibility.

Among the key players, companies like OMEGA Engineering and Micro Precision Calibration Inc. are recognized for their commitment to quality and precision in their calibration products. OMEGA Engineering, with its extensive range of temperature and pressure measurement tools, has established itself as a reliable provider in the calibration tubes segment. The company’s focus on innovation and customer satisfaction has allowed it to maintain a strong presence in the market. Similarly, Micro Precision Calibration Inc. is known for its comprehensive calibration services and high-quality calibration products, positioning itself as a trusted partner for industries seeking accurate calibration solutions. As the calibration tubes market continues to grow, the strategies and innovations of these key players will shape the competitive dynamics, influencing the overall direction of the market.

• 1 Appendix

  • 1.1 List of Tables
  • 1.2 List of Figures

• 2 Introduction

  • 2.1 Market Definition
  • 2.2 Scope of the Report
  • 2.3 Study Assumptions
  • 2.4 Base Currency & Forecast Periods

• 3 Market Dynamics

  • 3.1 Market Growth Factors
  • 3.2 Economic & Global Events
  • 3.3 Innovation Trends
  • 3.4 Supply Chain Analysis

• 4 Consumer Behavior

  • 4.1 Market Trends
  • 4.2 Pricing Analysis
  • 4.3 Buyer Insights

• 5 Key Player Profiles

  • 5.1 Accu-Labs
    • 5.1.1 Business Overview
    • 5.1.2 Products & Services
    • 5.1.3 Financials
    • 5.1.4 Recent Developments
    • 5.1.5 SWOT Analysis
  • 5.2 Ametek, Inc.
    • 5.2.1 Business Overview
    • 5.2.2 Products & Services
    • 5.2.3 Financials
    • 5.2.4 Recent Developments
    • 5.2.5 SWOT Analysis
  • 5.3 PCE Instruments
    • 5.3.1 Business Overview
    • 5.3.2 Products & Services
    • 5.3.3 Financials
    • 5.3.4 Recent Developments
    • 5.3.5 SWOT Analysis
  • 5.4 Tektronix, Inc.
    • 5.4.1 Business Overview
    • 5.4.2 Products & Services
    • 5.4.3 Financials
    • 5.4.4 Recent Developments
    • 5.4.5 SWOT Analysis
  • 5.5 Marathon Sensors
    • 5.5.1 Business Overview
    • 5.5.2 Products & Services
    • 5.5.3 Financials
    • 5.5.4 Recent Developments
    • 5.5.5 SWOT Analysis
  • 5.6 Fluke Corporation
    • 5.6.1 Business Overview
    • 5.6.2 Products & Services
    • 5.6.3 Financials
    • 5.6.4 Recent Developments
    • 5.6.5 SWOT Analysis
  • 5.7 Extech Instruments
    • 5.7.1 Business Overview
    • 5.7.2 Products & Services
    • 5.7.3 Financials
    • 5.7.4 Recent Developments
    • 5.7.5 SWOT Analysis
  • 5.8 Testo SE & Co. KGaA
    • 5.8.1 Business Overview
    • 5.8.2 Products & Services
    • 5.8.3 Financials
    • 5.8.4 Recent Developments
    • 5.8.5 SWOT Analysis
  • 5.9 WIKA Instrument, LP
    • 5.9.1 Business Overview
    • 5.9.2 Products & Services
    • 5.9.3 Financials
    • 5.9.4 Recent Developments
    • 5.9.5 SWOT Analysis
  • 5.10 GMC-I Instrumentation
    • 5.10.1 Business Overview
    • 5.10.2 Products & Services
    • 5.10.3 Financials
    • 5.10.4 Recent Developments
    • 5.10.5 SWOT Analysis
  • 5.11 OMEGA Engineering, Inc.
    • 5.11.1 Business Overview
    • 5.11.2 Products & Services
    • 5.11.3 Financials
    • 5.11.4 Recent Developments
    • 5.11.5 SWOT Analysis
  • 5.12 Keysight Technologies, Inc.
    • 5.12.1 Business Overview
    • 5.12.2 Products & Services
    • 5.12.3 Financials
    • 5.12.4 Recent Developments
    • 5.12.5 SWOT Analysis
  • 5.13 Micro Precision Calibration Inc.
    • 5.13.1 Business Overview
    • 5.13.2 Products & Services
    • 5.13.3 Financials
    • 5.13.4 Recent Developments
    • 5.13.5 SWOT Analysis
  • 5.14 National Instruments Corporation
    • 5.14.1 Business Overview
    • 5.14.2 Products & Services
    • 5.14.3 Financials
    • 5.14.4 Recent Developments
    • 5.14.5 SWOT Analysis
  • 5.15 Industrial Scientific Corporation
    • 5.15.1 Business Overview
    • 5.15.2 Products & Services
    • 5.15.3 Financials
    • 5.15.4 Recent Developments
    • 5.15.5 SWOT Analysis

• 6 Market Segmentation

  • 6.1 Calibration Tubes Market, By Application
    • 6.1.1 Industrial Calibration
    • 6.1.2 Laboratory Calibration
    • 6.1.3 Medical Calibration
    • 6.1.4 Environmental Calibration
    • 6.1.5 Automotive Calibration
  • 6.2 Calibration Tubes Market, By Product Type
    • 6.2.1 Glass Calibration Tubes
    • 6.2.2 Plastic Calibration Tubes
    • 6.2.3 Metal Calibration Tubes
    • 6.2.4 Silicone Calibration Tubes
    • 6.2.5 Ceramic Calibration Tubes
  • 6.3 Calibration Tubes Market, By Material Type
    • 6.3.1 Borosilicate Glass
    • 6.3.2 Stainless Steel
    • 6.3.3 Polypropylene
    • 6.3.4 PTFE
    • 6.3.5 Aluminum
  • 6.4 Calibration Tubes Market, By Distribution Channel
    • 6.4.1 Online Stores
    • 6.4.2 Specialty Stores
    • 6.4.3 Direct Sales
    • 6.4.4 Wholesalers/Distributors
    • 6.4.5 Others

• 7 Competitive Analysis

  • 7.1 Key Player Comparison
  • 7.2 Market Share Analysis
  • 7.3 Investment Trends
  • 7.4 SWOT Analysis

• 8 Research Methodology

  • 8.1 Analysis Design
  • 8.2 Research Phases
  • 8.3 Study Timeline

• 9 Future Market Outlook

  • 9.1 Growth Forecast
  • 9.2 Market Evolution

• 10 Geographical Overview

  • 10.1 Europe - Market Analysis
    • 10.1.1 By Country
      • 10.1.1.1 UK
      • 10.1.1.2 France
      • 10.1.1.3 Germany
      • 10.1.1.4 Spain
      • 10.1.1.5 Italy
  • 10.2 Asia Pacific - Market Analysis
    • 10.2.1 By Country
      • 10.2.1.1 India
      • 10.2.1.2 China
      • 10.2.1.3 Japan
      • 10.2.1.4 South Korea
  • 10.3 Latin America - Market Analysis
    • 10.3.1 By Country
      • 10.3.1.1 Brazil
      • 10.3.1.2 Argentina
      • 10.3.1.3 Mexico
  • 10.4 North America - Market Analysis
    • 10.4.1 By Country
      • 10.4.1.1 USA
      • 10.4.1.2 Canada
  • 10.5 Calibration Tubes Market by Region
  • 10.6 Middle East & Africa - Market Analysis
    • 10.6.1 By Country
      • 10.6.1.1 Middle East
      • 10.6.1.2 Africa

• 11 Global Economic Factors

  • 11.1 Inflation Impact
  • 11.2 Trade Policies

• 12 Technology & Innovation

  • 12.1 Emerging Technologies
  • 12.2 AI & Digital Trends
  • 12.3 Patent Research

• 13 Investment & Market Growth

  • 13.1 Funding Trends
  • 13.2 Future Market Projections

• 14 Market Overview & Key Insights

  • 14.1 Executive Summary
  • 14.2 Key Trends
  • 14.3 Market Challenges
  • 14.4 Regulatory Landscape

Segments Analyzed in the Report

The global Calibration Tubes market is categorized based on

By Product Type

• Glass Calibration Tubes
• Plastic Calibration Tubes
• Metal Calibration Tubes
• Silicone Calibration Tubes
• Ceramic Calibration Tubes

By Application

• Industrial Calibration
• Laboratory Calibration
• Medical Calibration
• Environmental Calibration
• Automotive Calibration

By Distribution Channel

• Online Stores
• Specialty Stores
• Direct Sales
• Wholesalers/Distributors
• Others

By Material Type

• Borosilicate Glass
• Stainless Steel
• Polypropylene
• PTFE
• Aluminum

By Region

• North America
• Europe
• Asia Pacific
• Latin America
• Middle East & Africa

Key Players

• Fluke Corporation
• Keysight Technologies, Inc.
• Tektronix, Inc.
• OMEGA Engineering, Inc.
• PCE Instruments
• Micro Precision Calibration Inc.
• National Instruments Corporation
• Extech Instruments
• GMC-I Instrumentation
• WIKA Instrument, LP
• Ametek, Inc.
• Marathon Sensors
• Accu-Labs
• Testo SE & Co. KGaA
• Industrial Scientific Corporation