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**

P2A software (parametrization, adjustment and analysis for PC), incl. USB cable (PC side) to the Mini-DIN interface (instrument)

P2A software (parametrization, adjustment and analysis for P... - P2A software

P2A software (parametrization, adjustment and analysis for P...

Industrial Manufacturing

P2A PC software <a href=https://www.testo.com/en-US/downloads/software-p2a>Download</a>

System requirements	Windows 7; Windows 8; Windows® 10

P2A software (parametrization, adjustment and analysis for P... - P2A software

P2A software (parametrization, adjustment and analysis for P... - P2A software

General technical data