Fischer HYGROMETER / THERMOMETER Humidity and Temp - Dial w/White Face & Stainless steel case
Humidity and Temperature dial with white face and stainless steel case.
The humidity is sensed by a Durotherm element that is a synthetic hygroscopic fiber that expands and contracts in response to the moisture in the air. The temperature is indicated by the actuation of a bimetallic spring which transmits changes by expansion and contraction.
NIST Certification - (order using item # NIST), See Link at right. The measurement of the temperature and relative humidity remains correct if the pressure goes up or down. This is confirmed for the pressure range of 600 … 1200 hPa (mbar) = 8.7 … 17.4 PSI.