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B + B Thermo-Technik Moisture metering system 1 pc(s) FF-GLT-10V-TEPT Reading range: 0 - 100 RH (L x W x H) 71 x 71 x 27 mm
Low-priced humidity measuring system in the wall housing for the inconspicuous and easy installation. With built-in sensors, high long-term stability - linearized and temperature compensated. AC/DC. Temperature measurement with passive PT1000...
https://www.bizrate.co.uk/morepetsupplies/b-b-thermo-technik-moisture-metering-oid27285854329.html