relative humidity transmitter / wall-mount

testo 6651 humidity/temperature transmitter for critical climate, accuracy up to ?1.7 %RH (depends on the probe), selectable signal outputs, optional display, optional ethernet module, optional relay, 2 analog outputs
Key Features:

High accuracy Testo RH sensor with proven long-term stability
Interchangeable, "smart", adjustable probes (wall, duct, cable)
"On the wall" easy calibration and adjustment
"Early warning" system allows proactive action before problems occur