Precise measurement technology for laboratories and cleanrooms

You wish to measure temperatures in laboratories with high precision? Then we recommend the multifunction measuring instruments testo 400 and testo 440. Both measuring instruments can be combined with multiple different probes – for monitoring all important air conditioning parameters in laboratories and cleanrooms. Whether universal or compact: At Testo, you will find the right multifunction measuring instrument for your requirement profile:

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

testo 400: universal


You place the highest requirements on your laboratory measuring equipment?

Then you can fulfil your complex tasks smarter, faster and better 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

High degree of precision is required

The specially designed, high-precision probes can assist you with these applications, for example: 

  • Highly accurate differential pressure measurement in any position (mit testo 400 only)
  • Reliable measurement of laminar flows
  • Accurately recording even the smallest differences in flow
  • Measuring humidity in critical processes: accuracy of 1%

  • 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

0636-9772-High-precision-temperature-humidity probe-fixed-cable-front-2000x1500px.jpg
  • 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

0636-9775-Robust-temperature-humidity-probe-for-temperatures-up-to-180 °C-fixed-cable-front-2000x1500px.jpg
  • 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.