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.

High humidity level probe w/ heated sensor element, no humidity on sensor

High humidity level probe w/ heated sensor element, no humid...

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Temperature - NTC	Measuring range -20 to +85 °C
	Accuracy ±0.4 °C (-10 to +50 °C) ±0.5 °C (-20 to -10.1 °C) ±0.5 °C (+50.1 to +100 °C)
	Reaction time 30 s

Humidity - Capacitive	Measuring range 0 to +100 %RH
Humidity - Capacitive	Accuracy ±2.5 %RH (0 to +100 %RH)

General technical data	Length probe shaft 300 mm
General technical data	Diameter probe shaft 12 mm

High humidity level probe w/ heated sensor element, no humid...

High humidity level probe w/ heated sensor element, no humid...

Temperature - NTC

Temperature - NTC

Humidity - Capacitive

Humidity - Capacitive

General technical data

General technical data