Precise measurement technology for laboratories and cleanrooms

Do you wish to measure temperatures with high precision in laboratories? If so, we recommend the testo 400 and testo 440 multifunction measuring instruments. Both instruments can be combined with multiple different probes – for monitoring all important air conditioning parameters in laboratories and cleanrooms. Whether you are looking for something universal or compact, Testo has the multifunction measuring instrument you need for your specific requirements:

  • Intuitive measurement menus
    Clearly structured measurement menus are stored in the instrument to guide you reliably and efficiently through the respective application. 
  • Convenient measurements
    Do you carry out measurements in environments where Bluetooth is not accessible? No problem, simply switch the probe head from the Bluetooth attachment to the cable handle and you're ready to go.
  • High-precision probes
    We offer fume cupboard probes for laboratories/cleanrooms; vane probes for laminar flow measurement; and humidity probes with an accuracy of <1%.
  • Intelligent calibration concept
    Only the probe heads need to be calibrated. You can then carry on working with the measuring instrument, handle, and another probe with ease.


testo 400: universal


Do you place the highest requirements on your laboratory measuring equipment?

If so, then you can fulfil your complex tasks with more speed, prescision and quality with the testo 400:

  • Easiest Smart-Touch operation
  • Complete data management
  • Clear graphic curve
  • Zero-error adjustment option

testo 440: compact


Are you looking for a compact measuring instrument with easy button operation?

Then the testo 440 is the right instrument for you:

  • Clear display
  • Easy button operation
  • Measure data storage in the instrument
  • Data export to PC as a .csv file

  • For measurements in liquids and pastes
  • Up to ±0.05 °C system accuracy
  • Measuring range from -80 to +300 °C
  • For reliable measurements in corrosive media
  • Up to ±0.3 °C system accuracy
  • Measuring range from -50 to +400 °C
  • For measurements in liquids and pastes
  • Up to ±0.15 °C system accuracy
  • Measuring range from -100 to +400 °C
  • For precise air temperature measurements
  • Up to ±0.15 °C system accuracy
  • Measuring range from -100 to +400 °C
  • For measurement in places that are difficult to access 
  • Up to ±0.3 °C system accuracy
  • Measuring range from -100 to +260 °C

Digital probes for humidity and temperature

High-precision humidity/temperature probe

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  • Records the relative air humidity and air temperature in indoor rooms
  • Accuracy of ±(0.6 %RH + 0.7 % of m.v.)
  • Calibration of air-conditioning cabinets according to DAkkS directive 5-7

humidity / temperature probe

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  • For measurements in industrial exhaust air, in bulk materials and in air-conditioning cabinets 
  • Calculation of wet bulb temperature, dew point and absolute humidity
  • Withstands tough ambient conditions up to +180 °C

Digital probes for flow measurements

Fume cupboard probe

  • Measures flow velocity, volume flow and air temperature
  • Clearly structured measurement menu for measurement in laboratory fume cupboards based on DIN EN 14175-3/-4
  • Automated absolute pressure compensation for accurate measurement results

High-precision vane probe (Ø 100 mm) including temperature sensor

  • Clearly structured measurement menu for volume flow and parallel determination of flow velocity, volume flow and air temperature
  • Ideal for laminar flow measurements: records smallest flow velocities from 0.1 m/s
  • Measuring range up to +70 °C

Measurements in a cleanroom

Valuable measuring facts about testo 400

Overview of the measurement menus

Which stored measurement menus in the testo 400 can assist you with measurements in laboratories and cleanrooms?

testo 400 brochure

Everything you need to know about the testo 400 universal IAQ instrument in one concise brochure.

All measuring instruments for the cleanroom

Accurate measuring technology for critical processes

All measuring instruments for laboratories

Reliable measurement technology for the most stringent requirements.