This space-mount, low-profile Humdity Transmitter has 10 point calibration accuracy and features a bulk polymer resistive sensor. 3% accuracy at 20 to 95% RH. Typical drift is less than 1% per year. The sensor output signal is field-selectable from 0-5 volt, 0-10 volt, or 4-20mA. Pre wired base makes installation easy. For use with Sensaphone Models: Express II, 2000, ISACC, SCADA 3000. Dimensions: 4.9" x 3.1" (12.4cm x 7.9cm) Weight: 0.2 lb (0.9 kg)