Digital Hygrometer indicates the present temperature and humidity at the the same time > Sensor Length: 50 to 150mm Standard Cable Length: 3 to 5 meters Configuration: 2/3 wire Sensor output: 4 to 20mA Input power supply: 8-24V DC Humidity Sensor Specifications:Sensor Output: 4 to 20 mA Input power supply: 8-24V DC