Features 1. Precise humidity and temperature control: The digital air humidity controller is equipped with a high-precision capacitive chip and digital temperature sensor probe to ensure accurate humidity measurement within the range of 1% to 99%RH, helping you to maintain the best environment for various applications. 2. Large and clear LED display: HM40 Type humidity controller has a large LED display, you can easily monitor and adjust the humidity and temperature levels as needed, the clear display ensures easy operation, suitable for professional and personal use. 3. Automatic humidification and dehumidification: This mini digital humidity controller has the function of setting high and low humidity limits. When the humidity exceeds these limits, the controller will automatically trigger humidification or dehumidification actions. This feature ensures that your desired humidity level is maintained without any manual intervention.. 4. Easy to install and operate: The digital air humidity controller includes a humidity controller sensor probe and a temperature sensor probe, both equipped with cables for easy installation. The user-friendly interface allows straightforward configuration and adjustment of settings. Whether you are a beginner or an experienced user, this controller provides effortless operation and ensures a seamless experience controlling humidity and temperature 5. Wide range of uses: The digital air humidity controller is widely used, whether you need to adjust the humidity and temperature in a greenhouse, laboratory or even at home, this controller can meet your requirements, such as seedling heating pads, home brewing, aquariums, pets Raising, incubation, barbecue, fermentation, accelerated germination, electric radiator, electric oven, etc. Features: 1. Wide humidity measuring range and control range from 1%RH to 99%RH. 2. 3-bit LED digital tube displays the humidity clearly. 3. Built-in humidity calibration function. 4. Robust shell design, waterproof and dustproof. 5. Accurate humidity control, stable performance.   Specification: Model: SVWL-8040 Humidity measuring range: 1%-99%RH Humidity control range: 1%-99%RH Measuring error: 0.03 Power supply: AC 220V Current: Maximum: 200mA Data retention: Yes Relay contact current: AC 5A/220V Operating temperature: 0~50℃ Storage temperature: -10~60℃ Size: 84*80*38mm / 3.3*3.1*1.5in Package weight: Approx. 212g/7.5oz   Package List: 1 x Air Humidity Controller with Probe Package List