reliability@optimum
Safe, precise, efficient:
Ensure reliable processes. Effortlessly comply with the strictest regulations. Achieve optimum performance for your systems.
With Testo – Partner of industry.
PARTNER OF INDUSTRY
Welcome to the optimum solution
High-quality measuring instruments, tailor-made solutions and premium services to ensure optimal performance: Here at Testo, this is what we are all about. Are you a service technician, process engineer or facility manager? Find out here how we can provide you with efficient, flexible and expert support.
Tackle time and cost pressures, staffing and skills shortages with intuitive solutions.
Simplify your management of system diversity and plant complexity with flexible solutions.
Use the opportunities of digitalization, automate processes and increase efficiency.
Stay informed and ahead. Comply with the latest standards and regulations – for greater sustainability and energy efficiency.
Expertise for industry and technical facility management
Industrial emission measurement
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HVAC/R
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Preventive maintenance
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Indoor climate monitoring
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A MUST-HAVE
Industry Magazine 2025:
Discover solutions, optimize processes
The free magazine for everyone who wants to optimize efficiency and safety in HVAC/R and production systems. Solutions, tips and insights - compact and indispensable.
INDUSTRIAL EMISSION MEASUREMENT
Versatile efficiency.
Flue gas analysis on large combustion plants
Process reliability, regulations, documentation requirements and energy costs: The key lies in the efficiency of the combustion plant. We have developed measurement technology for your flue gas analysis and the determination of O₂, CO and CO₂ levels to make your work easier.
Precise and robust flue gas measurement technology with a wide range of flue gas probes, sensors, and options to address specific challenges.
Sustainable solutions and instruments to ensure compliance with legally mandated emission limits – both now and in the future.
Reliable measurement technology that enables you to identify weak points and take targeted action to improve efficiency.
Reliable in practice
Emissions are measured in raw material and energy-intensive processes where gases such as CO, CO2, NOX or SO2 are released. The testo 350 flue gas analyzer comes with a wide range of flue gas probes, sensors and special options to help you meet your daily challenges.
This also impressed Markus Paur from Unitherm CEMCON:
Applications
When analyzing the burner’s behaviour, the focus of attention is often on fuel supply, atomization, control behaviour and emissions values.
Flue gas analyzers can be used to analyze all relevant gases and adjust the combustion process to achieve the best possible ratio of fuel to combustion air volume.
Two components. One seamless solution.
Flue gas analysis system testo 350
The analyzer unit and the control unit combine to form a powerful emissions measurement system – user-configurable, robust and ideal for demanding industrial environments.
testo 350
Analyzer unit
The shock-proof box contains sensors, pumps, and analysis and storage electronics. Can be controlled via the control unit or the testo easyEmission PC software.
testo 350
Control unit
Operating and display unit for convenient control of the analyzer unit – via Bluetooth or Testo data bus. With application-specific menu navigation for precise and efficient measurement procedures.
testo 350
Flue gas analysis system
The analyzer unit and control unit form a precise and robust measuring system for use in demanding conditions – including high gas concentrations, thanks to the extended measuring range
Selectable sensors: CO, O, O₂, NO, NO₂, SO₂, H₂S, CxHy or CO₂: You decide which sensors best suit your practical requirements.
Easy handling: Intuitive operation and fast on-site sensor replacement – no test gas adjustment needed, handled directly by the user.
Precision measurement technology: Representative, reliable and unrestricted emission measurement – even at high gas concentrations.
Robust design: Sealed housing with integrated impact protection enables use in harsh environments.
Overview of our emission analyzers
Flue gas analysis for small and medium-sized systems
Efficient, intuitive, connected: With the testo 300 NEXT LEVEL Industry kits, you get everything you need for fast and reliable flue gas measurement – including wireless parallel measurement, second-screen functionality and seamless documentation.
Recommended by the professionals.
Read what users say about Testo's flue gas analyzers:
In complex fuel scenarios such as those in cement plants, reliability is crucial. Testo’s robust measurement technology enables us to obtain accurate data, which is essential for properly evaluating processes and offering our customers the best possible service. This improves both energy efficiency and product quality. That’s why we’ve relied exclusively on Testo flue gas analyzers since 2011.
Markus Paur
Lead Commissioning Engineer, Unitherm CEMCON
Hear directly from the experts on site
Discover how real-time flue gas data and AI are revolutionising the efficiency of combustion processes, reducing emissions and saving costs. Read the article from the latest issue of World Cement Magazine and experience digital transformation in practice!
PRACTICAL GUIDE
Industrial flue gas analysis
In this comprehensive reference work, you will find practical tips and tricks on the subject of industrial emission measurement. Get your exclusive copy of the new guide to emission and process measurement now.
HVAC/R
Everything within the permissible range.
Process reliability for your HVAC/R systems
Ensure safe and optimal operation, lower operating costs and reduce CO₂ emissions. With efficient heating systems, high-performance refrigeration systems and precisely regulated air conditioning and ventilation systems, you can reliably monitor the key parameters and ensure maximum process reliability – and of course in compliance with all standards.
Sustainable: Precision measurement technology – reduce emissions, increase efficiency and ensure safety.
Intuitive: Simple operation and structured workflows ensure seamless performance – even in time-critical situations.
Smart connectivity: One app for all applications, digital documentation, and seamless integration into your current systems.
Reliable support: Customized calibration, hands-on training and one-to-one consulting.
HEATING MEASUREMENT TECHNOLOGY
Reliable and precise measurement.
Exploit potential to the full
With a comprehensive product portfolio, precise measurement technology and tailor-made solutions, you can reliably optimize heating systems and heat pumps. Thanks to the testo Smart App, you can carry out all measurement tasks quickly, efficiently and completely documented.
Flue gas measurement at the next level.
testo 300 NEXT LEVEL
Efficient: Wireless parallel measurement of up to four parameters via smart probes and second screen function
Safe: Thanks to integrated sensor protection against CO poisoning for instruments with a measuring capacity of up to 30,000 ppm
Reliable: Extended warranty periods and robust design
Flexible: Probes for every application and many scaling options thanks to attachments and adapters
Practical: Document, save and send all measurement values with the testo Smart App (alternatively data integration in your own software)
CHECKLIST
Carry out parallel measurement
safely
Our checklist shows you step by step how to carry out parallel measurements safely and efficiently with the testo 300 NEXT LEVEL. From preparation to digital documentation – everything is explained clearly and simply. Benefit from valuable tips that will make your work noticeably easier!
Simply precise.
testo 310 II flue gas analyzer
Efficient: Measure up to 7 parameters in parallel and show them on the configurable display
Automatic and precise: Measuring cells for O₂, CO and integrated temperature sensor calculate the relevant measurement parameters
Simple: Thanks to intuitive menu navigation and digital documentation, data transfer and customer data management
Smart probes for wireless
parallel measurement – with smartphone operation
WITH BLUETOOTH®
Differential pressure measuring instrument
Pocket-sized temperature and air density-compensated differential pressure measurement. Easy viewing and dispatch of readings on a smartphone.
WITH BLUETOOTH®
Thermometer with immersion/penetration probe
For fast, flexible and easy temperature measurements in liquid, semi-solid and pasty media.
WITH BLUETOOTH®
testo Smart Probes HVAC kit
Wireless, versatile, easy to use: The HVAC set offers everything you need for fast and flexible temperature and differential pressure measurement.
Measurement technology from Testo makes daily work easier.
Development principle:
Our aim is to develop new functionalities that can be integrated into your workflow. In doing so, we view instrument level and the overall system and do not limit ourselves to new developments, but continuously add new functions to our existing portfolio. So with Testo you are always up-to-date.
Niklas Eisenkolb
Product Manager Heating
RECOMMENDED BY THE PROS:
The combination of the testo 300 NEXT LEVEL and the testo App is user-friendly and time-saving. I need half an hour less time per customer.
Jovany David
Owner
Technology built for the future. Delivering results today.
Kits for heat pumps and hybrid systems
With Testo’s heat pump kits, you have all the tools you need to optimize heating systems for energy efficiency, reducing operating costs and emissions. For facility managers who are already planning for the future. Find the ideal kit for your application today.
Select a suitable set:
More efficient than ever before.
testo 558s heat pump professional kit
Intuitive operation: App feeling in your everyday work
Full connectivity: Seamlessly control all components via the digital manifold or the testo Smart App
Maximum safety: A3 and A2L compatibility for 96 refrigerants and free updates
Efficient: Save time and reduce costs with clever functions and central data management
EXCLUSIVE GUIDE
Heat pump knowledge in 4 modules
In-depth knowledge about heat pumps – practical, concise and immediately applicable. Over the course of four modules, you will learn how to operate systems efficiently, take accurate measurements and achieve sustainable results.
One App for all applications
The free testo Smart App provides valuable support for commissioning and maintaining refrigeration, air conditioning and heating systems. With the testo Smart App, you can carry out and document all your measurement tasks faster, easier and more reliably:
Automatic Bluetooth pairing and easy configuration
Remote measurement and monitoring of live measurement data
Second screen function on tablet or smartphone
Easy creation and sending of measurement reports
Parallel measurement
Efficient and reliable
Documentation
Simple and secure
Customer data management
Quick and easy
Data transfer
Professional and convenient
Second screen
Simply convenient
Remote control
Easy and versatile
REFRIGERATION MEASUREMENT TECHNOLOGY
Perfect power play. Reliable results
With precise measurement technology from Testo, you can achieve reliable measurement results – at all times and under all conditions. Smart sensors and seamless connectivity record, analyze and document all relevant parameters centrally. This allows you to evaluate your refrigeration systems safely and efficiently, maximize cost-effectiveness and ensure maximum process reliability.
Efficiency meets simplicity.
The new testo 558s
Everything at a glance: New clear measurement value graphs (incl. 30-minute trend curves) for reliable system assessment
Wireless: Full connectivity to the entire refrigeration technology portfolio such as testo Smart Probes, refrigerant scale, pump and more
Maximum safety: A3 and A2L compatibility for 96 refrigerants and free updates
Long-term data recording: Up to 72 h as an upgrade via in-app purchase
Technology that makes a difference – every day
Chloe Jennings from Delta T Refrigeration sums it up perfectly: "Operation via the touchscreen is incredibly intuitive – and the display really makes the job noticeably easier." Watch the video to see how the new testo 558s manifold can make your day-to-day work even more efficient and sustainable.
With the practical Smart Vacuum kits
Ready to go immediately
Powerplay for sustainable refrigeration.
Fully automatic evacuation and charging
With the smart testo 565i vacuum pump and the testo 560i refrigerant scale, you can automate key steps in system evacuation and charging – for maximum process reliability and improved energy efficiency. Experience how efficient sustainable refrigeration can be today.
Time-saving charging.
Refrigerant scale testo 560i
Simply enter the target value for superheating, subcooling or weight in the manifold or the app. The scale with smart valve automatically stops the charging process as soon as the target values are reached.
Fully automatic evacuation.
testo 565i vacuum pump
Thanks to the connection to the testo 552i vacuum probe, when the desired vacuum target value is reached it automatically stops evacuating refrigeration systems and simultaneously starts a vacuum holding test.
Time-saving charging.
Refrigerant scale testo 560i
Simply enter the target value for superheating, subcooling or weight in the manifold or the app. The scale with smart valve automatically stops the charging process as soon as the target values are reached.
Smart connectivity for future-proof processes.
Fully automatic evacuation and filling.
Vacuum pump and refrigerant scale
VACUUM PUMP
Fully automatic evacuation
Thanks to the connection to the testo 552i vacuum probe, when the desired vacuum target value is reached it automatically stops evacuating refrigeration systems and simultaneously starts a vacuum holding test.
REFRIGERANT SCALE
Time-saving and precise charging
Simply enter the target value for superheating, subcooling or weight in the manifold or app, and the scale with smart valve stops filling automatically when the target values are reached.
VENTILATION AND AIR CONDITIONING TECHNOLOGY
Maximum efficiency. Reassuringly reliable
Set new standards in the maintenance of air conditioning and ventilation systems and the assessment of indoor air quality. Automated measurement processes, intuitive user guidance and state-of-the-art sensor technology enable precise monitoring of climate-relevant parameters such as temperature, humidity and airflow velocity in real time. Minimize risks, ensure optimum operation and maximize the process reliability of your systems.
Can be used universally
Air conditioning and ventilation systems
Efficient control, measurable savings: With Testo measurement technology, you can reliably ensure indoor comfort and energy efficiency
The sustainable multitasker.
Universal climate meter testo 400
Just one instrument for all climate parameters: Flow, temperature, humidity, CO₂, CO and more
Wide range of probes: Flexible, compatible Bluetooth® and cable probes for every application
Intelligent assistants: Guide you intuitively through all applications in compliance with the standards – for reliable and traceable results
Sustainably future-proof: For energy-efficient buildings, cleanrooms, laboratories and sophisticated IAQ measurements of the highest standard.
Flow and IAQ kits.
Practical, precise, and future-proof
Practical helpers for efficient workflows
Fast, precise – perfect with app
With the compact professional measuring instruments from Testo and the testo Smart App, you always have an overview of key environmental parameters such as temperature, humidity, flow, CO₂ or pressure. Maximum efficiency, easy to use and precise results thanks to the app connection.
Digital thermohygrometer
With the handy thermohygrometer, you can reliably check humidity values – ideal for a precise quick check.
16 mm vane anemometer
For flexible flow measurements in ventilation ducts. The telescope probe can be extended up to 850 mm.
100 mm vane anemometer with measuring funnels
Simple, efficient and precise: Measurement at air inlets and outlets, at disk valves and for regulating controlled domestic ventilation.
PREVENTIVE MAINTENANCE
Ensure process stability. Increase efficiency.
Recognize problems before they arise
Testo thermal imagers allow you to monitor technical installations and electrical systems precisely, non-intrusively and reliably. They detect overheating or wear at an early stage, carry out routine inspections efficiently and document results effortlessly.
Easy to use and provides crystal-clear thermal images for fast, reliable results.
Can be carried out during ongoing operation, with personnel safety ensured thanks to non-contact measurement.
Simplified workflows with automatic site recognition plus professional analysis and documentation.
Stay one step ahead:
Prevent breakdowns with preventive maintenance
Use thermography to detect hotspots or uneven heat distribution early on, helping you to prevent breakdowns, energy losses, and costly damage to control cabinets, motors, pumps and transformers.
This can help you to sustainably extend the lifespan of your equipment, particularly when it comes to energy-intensive systems or superheated steam lines.
No defect goes undetected.
Thermal imager for professionals
No defect goes undetected.
Thermal imager for professionals
Whether you’re carrying out preventive maintenance with the testo 883-1 thermal imager or the energy optimization of buildings using the testo 883-2 thermal imager – you can rely on top image quality, efficient workflows and sustainable results.
Preventive maintenance at the highest level. testo 883-1 thermal imager
Thanks to its excellent image quality, intelligent image data management and intuitive analysis and documentation, the testo 883-1 is the ideal solution for all thermal measurement tasks in industrial environments.
testo SiteRecognition: measurement site recognition and automatic image management
This function automatically detects measurement objects and reliably and unambiguously stores the corresponding thermal images. This way, you can save time, avoid mix-ups – and work more efficiently and reliably.
Easy thermal image analysis. IRSoft analysis software
The IRSoft PC software provides professional analysis, documentation and archiving of your images – supporting informed decision-making and impactful reporting
Energy efficiency of buildings. testo 883-2 thermal imager
The testo 883-2 helps you identify thermal weak points – with its top image quality, wide-angle and optional telephoto lens, and convenient analysis and documentation software.
Easy thermal image analysis. IRSoft analysis software
The IRSoft PC software provides professional analysis, documentation and archiving of your images – supporting informed decision-making and impactful reporting.
Practical guide for the use of thermal imagers
Switch on. Point. Know.
The right thermal imager for every type of user:
Regardless of which instrument you choose, you can work with razor-sharp images and use the many smart functions to make your tasks as efficient as possible.
For professionals
The optimum solution for all thermal measurement tasks in industrial environments. Manual focus and interchangeable lenses ensure maximum flexibility and full control.
For all-rounders
Perfect support thanks to the integrated laser marker, wireless connection of the clamp meter or the practical second screen function via the testo Thermography App
More reliability with the testo 883-1 thermal imager
Recommended by the professionals:
Since we started using testo SiteRecognition, we’re saving multiple work hours on our nearly 1900 switching cabinets.
Udo Moser
Service and maintenance Cerdia Produktions GmbH
More reliability with the testo 883-1 thermal imager
Recommended by the professionals:
I would recommend the imager at any time. It’s the perfect tool for professionals.
Christian Schächtele
badenovaWÄRMEPLUS GmbH & Co. KG
CLIMATE MONITORING
Good climate. Reliable processes
In industrial plants, offices and public buildings: Precise monitoring of the indoor climate is the key to stable processes and high energy efficiency. Whether fully automated with a cloud connection or as a stand-alone version for simple measuring tasks: Experience how Testo makes your climate monitoring smarter, more reliable and more efficient.
testo Smart App – everything, everywhere
Commissioning, measured values, push notifications and data analysis: With the testo Smart App you always have full control. (Note: Testo Data Monitoring license required)
testo Saveris Cloud – secure, in real time
The online data loggers connect seamlessly to the testo Saveris Cloud – the prerequisite for real-time climate monitoring. Deviations are detected immediately so that you can react in good time. (Note: Testo Data Monitoring license required)
testo 162 online data logger – for many measurement parameters
Maximum flexibility thanks to the integration of external sensors. The built-in display of the WiFi-enabled online data logger enables direct visual inspection on site.
testo 164 online data logger – for many measurement sites
Unobtrusive and independent, the online data logger integrates visually and functionally into its surroundings and can be linked to the testo 164 GW gateway at the touch of a button.
Maximum safety. Minimum effort.
Online data logger system
Climate monitoring almost by itself: The online data loggers connect to the testo Saveris Cloud – the prerequisite for real-time climate monitoring. Thanks to continuous data storage, automated documentation and alerts by push message or e-mail, you can detect deviations immediately and take action in good time. With the testo Smart App you always keep everything under control. (Note: Testo Data Monitoring license required)
The right logger for every application: Functionalities, measurement parameters and WiFi infrastructure.
Safe and compliant: The testo Saveris Cloud meets the highest safety standards and is certified in accordance with EN 12830.
Always and everywhere: Everything under control with the testo Smart App – from commissioning to data analysis.
How to find the right data logger
Whether mobile or stationary, with an app, PC software or cloud-based online monitoring system: Testo has the right solution for you.
Understanding the system – combining loggers
Our product matrix shows which loggers are part of the online data logger system, which measurements they cover and how they can be combined – clearly and concisely.
5 steps to the right logger
From the application environment and the measurement parameters to the type of documentation and alarms: Answer five questions and find the right data logger for you.
All climate data loggers at a glance
The brochure gives you an overview of all data loggers. It guides you to the right system and therefore to the right solution for your application.
Simply reliable.
Mini data loggers testo 174
Compact and efficient: Monitor temperature and humidity easily and cost-effectively – ideal for just a few measuring points.
Precise and flexible: Use the app connection or USB-C for quick and uncomplicated data evaluation.
Intuitive and license-free: Benefit from a secure and user-friendly application without additional license costs.
Functionalities at a glance:
Download the industry flyer and get a quick overview of the mini data loggers.
testo Smart World.
Optimized workflows
Connected measurement technology, seamless compatibility and innovative applications:
The testo Smart World will open up new possibilities for you.
Data management: Testo measurement technology delivers accurate information for sustainable improvements. Fast, precise and in real time.
Process optimization: Automated monitoring of critical parameters reduces manual work steps and increases efficiency.
Cost efficiency: The digital collection, analysis and documentation of critical parameters results in the optimal use of resources.
Become part of the testo Smart World:
Browse the Industry Magazine now
A must-have:
The new Industry Magazine
For those who want an overview: Get the free Industry Magazine for an overview of the entire range of measurement technology and solutions for all applications in industrial environments and in technical facility management.