Room humidity sensors 24vdc Voltage

View Details Siemens QFA2001 ROOM RH SENSOR, 4-20MA, 2 WIRE, 5%  | Blackhawk Supply
$174.88 each
View Details Siemens QFA4171D ROOM RH&T SNSR, 4-20mA, 2%, DSPLAY, CERT  | Blackhawk Supply
$657.70 each
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