testo 6621 humidity-/temperature transmitter, accuracy &plusmn;2.0 %RH, wall or duct version, selectable signal outputs, optional display, external interface for adjustment and setup, 2 analog outputs 
 
**NOTE: Please contact Testo to ensure proper configuration when ordering the testo 6621 Transmitter**

testo 6651 humidity/temperature transmitter for critical climate, accuracy up to &plusmn;1.7 %RH (depends on the probe), selectable signal outputs, optional display, optional ethernet module, optional relay, 2 analog outputs 
 
**NOTE: Please contact Testo to ensure proper configuration when ordering the testo 6651 Transmitter**

testo 6681 industrial humidity/temperature transmitter, accuracy up to &plusmn;1.0 %RH (depends on the probe), selectable signal outputs, optional display, optional ethernet or profibus module, output of all relevant humidity parameters, optional relay, optional 3rd analog output 
 
**NOTE: Please contact Testo to ensure proper configuration when ordering the testo 6681 Transmitter**

PTFE sintered filter with 1.5 mm condensate drip hole, ideal for high humidity with condensation protection 0554 0166

Protective cap made of PTFE with drip hole

PTFE sintered filter with 1.5 mm condensate drip hole, ideal...

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