WH8040 Digital Humidity Controller Air Humidity Control Controller Home Fridge Cooler Hygrometer Control Switch 12V 24V 220V 40% off      Feature:        Function of humidification and dehumidification / Hysteresis function    Humidity correction / Delay protection    Function of Upper and Lower limit / with wide humidity measuring range and controlling range    Comes with a humidity controller sensor probe with cable and a temperature sensor probe with cable    Humidity Measuring Range: 1% ~ 99% RH / Humidity controlling range: 1% ~ 99% RH         Specification:     Humidity Measuring Error: 3%   Resolution: 1% RH;   Sensor Type: HM-40   Power Suppler: AC 220V   Current: MAX 200MA   Data retention: YES   Power consumption: < 3w,=" max=" 200ma=">   Relay contact current: AC 5A/220V   Temperature compensation: YES   Data Retention: YES   Working temperature: 0°C - 50 °C   Storage temperature: -10°C - 60 °C   Size(L x W x H): Approx. 83 x 75 x 33mm   Probe size(D x L): Approx. 4 x 20mm      Key notes:     RST: Press key RST to switch satrting up and power off, on the condition of power off, it can start up when press key RST, on the condition of starting up, it can power off when press and hold the key RST for three seconds.   SET: Press key SET to enter settings of humidity control, and press key ▲ or ▼ to adjust.   Press and hold key ▲ or ▼ for three seconds to enter the fast adjust mode.   Press key SET again to exit setting mode.      Package Includes:     1 x Humidity controller WH8040   1 x Humidity controller sensor probe with cable   1 x Temperature sensor probe with cable      Note:The temperature sensor being used to calculate humidity more precise depending on the temperature inside of the house and it should be installed in the vicinity of the humidity probe.