Transmitters

Testo 6651 humidity/temperature transmitter for critical climate, accuracy up to ±1.7 %RH (depends on the probe), 4 to 20mA(2 wire, 24VDC) no relays or ethernet, no display, no ethernet module, no relay, 2 analog outputs.

In industrial processes or in research-based business, the Testo 6681 temperature and humidity transmitter is ideal wherever critical climatic values need to be maintained.

Measures relative humidity and temperature, and calculates dew/frost point for HVAC applications, with a focus on reliability and repeatability. Ideal for use in offices and other indoor environments.