testo 6351 Differential Pressure Transmitter 
 
**NOTE: Please contact Testo to ensure proper configuration when ordering the testo 6351 Transmitter**

testo 6381 differential pressure transmitter with calculation of flow velocity and optionally with humidity/temperature, accuracy &plusmn;0.5% of measuring range final value, automatic zero-point adjustment, selectable measuring range between 10 to 1000hPa, selectable signal outputs, optional display, output of all relevant pressure, flow and humidity paramters 
 
**NOTE: Please contact Testo to ensure proper configuration when ordering the testo 6381 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**

The Ethernet connector can be easily patched to an existing network cable. The special connector ensures tightness according to IP protection class IP65.