You can keep a close eye on indoor air quality with the testo 445 climate measuring instrument: the allrounder can measure up to 6 parameters (with the appropriate probe), which can help you make a professional assessment of indoor air quality. The climate measuring instrument therefore supports you in adjusting and checking ventilation and air conditioning systems.

The testo 645 humidity/temperature measuring instrument automatically indicates the measurement parameters of relative humidity, absolute humidity, dew point, degree of humidity, enthalpy and temperature at the touch of a button.

Humidity/temperature probe

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Measuring range	-20 to +70 °C
Accuracy	±0,4 °C (+0,1 to +50 °C) ±0,5 °C (-20 to 0 °C) ±0,5 °C (+50,1 to +70 °C)
Reaction time	12 s

Measuring range	0 to +100 %RH
Accuracy	±2 %RH (+2 to +98 %RH)

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Humidity/temperature probe

Humidity/temperature probe

Temperature - NTC

Humidity - Capacitive

General technical data

Diameter probe shaft	21 mm