Thermal anemometers without smartphone operation

The functional testing of ventilation and air conditioning systems includes monitoring the flow speed in ventilation ducts. If the air flow velocity and volumetric flow are not set correctly, the room air quality may suffer. The testo 425 thermal anemometer measures the flow speed and automatically calculates the volumetric flow.

• 3 in 1 Measurements Temperature, air flow & volumetric flow calcualtion 

• Extendable telescopic probe 

• Single & multi-point averaging 

• Hold button to freeze readings 

Use the testo 405 Low Cost Thermal Anemometer to measure air velocity, volumetric flow and air temperature. It is suitable for carrying out quick check measurements in ventilation ducts and for measuring the air velocity in rooms, e.g. at draughty windows. 

• 3 in 1 Air temperature, air velocity
  & volumetric Air flow 

• Telescopic handle to 300 mm 

• Illuminated display

• Volume flow calculation up to 99,990 m3/h