testo 405 Low Cost Thermal Anemometer


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.

If, in your capacity as an HVAC engineer / technician, you carry out fast check measurements in ventilation ducts or in rooms, then the Testo 405 thermal anemometer is a must-have. The anemometer features a permanently mounted telescope and enables you to measure air flow, volumetric flow and air temperature. The measuring range for flow is between 0 to 10 m/s, volumetric flows are calculated up to 99,990 m3/h.

 The extendable telescope (up to 300 mm) makes the thermal anemometer particularly suitable for flow measurements in ventilation ducts. The illuminated display can be swivelled into various positions, ensuring that the readings can be read off comfortably. The duct bracket (included in the delivery) offers key practical advantages. You can use this to optimally position the telescope in the ventilation duct and obtain precise measurement results.

The testo 405 thermal anemometer measures particularly accurately in the range between 0 and 2 m/s, you can also use it to measure the air velocity in rooms. Low air velocities, are quickly located and accurately measured using the anemometer.

Integrated sensor protection: when you are not using the testo 405 thermal anemometer, the rotating protective cap protects the sensors from dust.

More Information
Warranty2 Years
Technical Data
Storage Temperature-20 to +70 °C 
Operating temperature --10 to +50 °C 
Battery type2 AAA micro batteries
Dimensions 490 x 37 x 36 mm 
Instrument Sensor
Measuring range Temperature  -20 to +50 °C 
 Air Velocity0 to 5 m/s (-20 to 0 °C) | 0 to 10 m/s (0 to +50 °C) 
 Volume Flow0 to +99990 m³/h  
AccuracyTemperature ±0.5 °C 
 Air Velocity±(0.1 m/s + 5% of mv) (0 to +2 m/s) | ±(0.3 m/s + 5% of mv) (remaining range)
Resolution Temperature 0.1 °C | 0.01 m/s 
 Air Velocity 

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