Humidity Controller

  • The ideal humidity level to foster plant growth is between 50 and 70 percent.
  • However, in summer, due to hot weather, the heat tends to absorb most of the humidity that plants desperately need for proper growth.
  • And when the humidity level inside your greenhouse falls below 30 percent RH, the plants begin to wilt which further halts their growth process.
  • To attain ideal humidity levels in your greenhouse, consider investing in and installing our advanced and easy-to-use humidity controller.


  • Humidity Measuring Range: 1% ~ 99% RH
  • Humidity controlling range: 1% ~ 99% RH
  • Humidity Conditions Measuring Error: 3%
  • Resolution: 1% RH;
  • Sensor Type: HM-40
  • Current: MAX 200MA
  • Power consumption: < 3W, Max 200mA
  • Relay contact current: AC 5A/110V


  • Hysteresis function
  • Humidity correction
  • Delay protection
  • Upper and Lower limit functions
More Information
Product Kind Controller

Product Questions

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How far can the sensor be placed from control unit. I have two greenhouses 40 and 85 feet from my control room. I would like to separate the sensor from the electronics
Question by: tony on Oct 21, 2021, 12:06 AM
Sensor can be extended to any desired area using low voltage thermostat wire found at local hardware stores.
Answer by: Admin on Dec 5, 2021, 10:20 PM