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Temperature measuring instruments.



Recording the surface temperature is vitally important for a great number of processes in industry and trade. Amongst other things, it enables the quality criteria of products and systems in heating engineering, the building trade, the energy sector and manufacturing industry to be met.


Testo thermometer

A Testo surface temperature meter offers you the following:

  • Intuitive operation and high-precision measurement results
  • Comprehensive portfolio of exchangeable probes for every application – customized products are also possible
  • Robust construction for daily use
  • Calibration by the experts in our subsidiary, Testo Industrial Services

Infrared thermometers


  • An instrument for the fast, non-contact measurement of the surface temperature.
  • Easy temperature measurement, even with dynamic processes or in locations that are difficult to access.
  • Reliable temperature measurement with cost-effective technology

Immersion thermometers


  • Quick, reliable temperature control for everyday use.
  • Thin, lightning-fast probe tips for clean measurement, e.g. in food processing.
  • High-precision temperature measurement even in aggressive media.
  • Infrared measurement for exceptionally fast temperature scans.
  • Wide variety of models and outstanding value for money.

Humidity measurement

 A moisture meter is always used when the moisture content in the air or solids needs to be measured accurately. One of the most common applications is measuring the moisture in the air using a hygrometer.


Testo 635

The testo 635-1 temperature and humidity measuring instrument is ideally equipped for checking the air humidity, temperature and dew point in living areas, in production, storage and server areas and in museums and cold stores. Measurements of the ambient absolute pressure and dew point in compressed air can be quickly and efficiently carried out with the testo 635-1.

Testo 835-H1

Infrared thermometer plus moisture measuring

Testo 625

The testo 625 compact thermohygrometer has a connectable humidity sensor which measures the air temperature and relative humidity. It can also calculate the dew point and wet bulb temperature.

The meter is equipped with a large, easy-to-read, backlit display, a hold function which allows you to freeze the last reading and min and max readings that can be displayed at the touch of a key.


Pressure monitor

Alongside temperature, pressure is one of the most important measurement parameters. Whether absolute pressure, differential pressure or relative pressure – Testo offers the ideal electronic or digital pressure measuring instrument for every measurement requirement involving the pressure parameter.

Testo 549i


The professional and compact testo 549i high-pressure gauge can be controlled via the testo Smart Probes App using your smartphone or tablet, and is ideal for carrying out servicing and troubleshooting on air conditioning and refrigeration systems. The App also enables evaporation and condensation temperatures to be calculated automatically.

Testo 511

Small, handy and practical: the testo 511 absolute pressure meter measures absolute pressure and is also suitable for measuring the barometric altitude between two points.

Testo 557s

The testo 557 digital manifold fulfils numerous functions, which are required for working on refrigeration systems and heat pumps, in just one instrument: for example superheating/subcooling calculation, vacuum measurement, temperature-compensated leakage test.


Emission measuring devices

Environmental pollution due to emissions is no secret. It is actually the case that more and more problems have been occurring over recent years due to the increase in pollution. There are guidelines here for those responsible for keeping emissions in their area of responsibility under control. However, to do this you have to have an emission measuring device to hand.


Testo 310

Testo 350

Testo 316

Leak detector

Whether it’s for a small system or an industrial plant, whether you are an occasional user or a heavy user – we have the perfect solution for fast, reliable leak detection.

Find out more about the series with the world’s first 2-in-1 sensor for gas and refrigerant


Testo 340

Testo 338

Smoke tester


Flow meter / anemometer

There are different designs of the flow meter. It is also available as an anemometer and can be used in a variety of areas. There are thus some sectors, particularly in the industrial field, where flow measurement plays an important role. In addition to duct measurement, these also include outlet measurement and filter measurement.


Testo 440

Testo 417

Testo 420

Testo 405


CO₂, CO, Light, Sound, rpm

Regular measurement of indoor air quality and comfort levels in workplaces enables the exact setting of the indoor climate and reduces the risk of staff shortages due to illness. Indoor air quality and comfort level measurement therefore also leads to fostering better staff performance.


Testo 440

Testo 540

Testo 400

Testo 317-3

Testo 815


Intrumenti za mjerenje električnih veličina

Testo sets new standards in electrical measuring technology. Whether multimeters, clamp meters, current testers or voltage testers – thanks to innovative technologies and simplified application, Testo’s measuring instruments measure electrical parameters such as current, voltage or resistance more reliably and precisely than ever before.


Testo 745

Testo 750-2

Testo 755-2

Testo 760-3

Testo 770-2


The data logger

In industry, but also in public buildings as well as in the private sector, it may be necessary to measure some values involving the air. In addition to temperature and humidity, the CO₂ value for example also provides information about the indoor air quality. In order to ensure pleasant IAQ, you need a regular overview of the evolution of these values. This is where a logger is used.


Testo 160

Testo 175-H1

Testo Saveris 2

  • Automated temperature monitoring with integrated probe

  • WiFI data logger system with easy installation and operation

  • Call up temperature data at any time via Smartphone, tablet or PC

  • Limit value violation alarms by e-mail or (optionally) SMS

Testo 184-G1

Testo 174T


Thermal Imaging Cameras

The measuring instrument for every application: there are hardly any measuring instruments that are as versatile as a thermal imager.


Testo 872

Testo 883

New thermal camera from Testo

  • Best image quality: IR resolution of 320 x 240 pixels (with SuperResolution 640 x 480 pixels); NETD < 40 mk
  • Useful features: testo SiteRecognition intelligent image management and testo ScaleAssist automatic contrast adjustment
  • Extensive analysis and documentation: With the intuitive professional software testo IRSoft
  • Full control: Manual focus and interchangeable lenses


Testo 885


Smart Probes

Measurement is more mobile, more productive and easier than ever before, with the new Smart Probes from Testo. Because the compact pro measuring instruments can be operated wirelessly with your own smartphone or tablet via the testo Smart Probes App, and conveniently transported in the handy testo Smart Case. That way, you always have all your measurement technology with you and immediately ready to hand.


The new Testo smart program

  • 11 measuring intruments
  • 9 measurement parameters
  • 1 App 

Our new digital HVAC measuring instruments give you precise readings – easily and quickly

The Smart Probes

  • Comprehensive range of measuring instruments for monitoring temperature, pressure, humidity and flow velocity
  • Practical kits for the most important applications in heating, air conditioning, ventilation and refrigeration
  • Operation and documentation completely via testo Smart Probes App

Compressed air meters

In industrial companies, compressed air is an important source of energy which incurs high consumption costs. Testo compressed air meters enable you to measure compressed air consumption with a high degree of accuracy. This makes it possible for you to save energy and reduce costs. Compressed air meters can also be used for the targeted implementation of environmental management (e.g. as per ISO 50.001 or ISO 14.001). Another field of application is monitoring leaks in your compressed air system. The compressed air meter can also be used to carry out a peak load analysis in order to determine whether you are generating compressed air of sufficient capacity. The newly developed “all-in-one sensor” not only records the compressed air consumption and the temperature, but even the pressure too. This eliminates the need for you to carry out a separate pressure measurement. Compressed air meters in the testo 645X series use the calorimetric measuring principle. For you, this means that additional pressure and temperature measurement is not needed. At the same time, there are no mechanically moving parts, which means less wear and tear.


Testo 6451-6454

Suitable for pipe mounting, compatible with all common diameters

Testo 6448

Compressed air meter with bar probe (DN40-250)

Testo 6456/6457

Suitable for fixed installation, compatible with large diameters

Testo Sensor LD

Leak detector – Investigating compressed air costs

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