... humidity controllers 1. control: PID, P, PI, PD, ON/OFF 2. high accuracy 3. Modbus, RS485 Intelligent temperature and humidity ... protocol communications; 6. Optional with RH relative humidity control or dry-bulb temperature control; 7. ... 900, it could serve as a constant temperature humidity box (room) control.Specifications:InputRTD: two group ... , 0~90% RHPower comsumed: under 5VA Humidity controllers