Features 1. Wide range: wide range of humidity measurement and adjustment range from 1% RH to 99% RH. 2.3-BIT LED DIGITAL TUBE: Shows moisture clearly. 3. Air humidity controller: built-in humidity correction function. 4. Robust shell design: waterproof and dustproof. 5.ACCURATE HUMIDITY CONTROL: Stable performance. Features: 1. Wide range: wide range of humidity measurement and adjustment range from 1% RH to 99% RH. 2.3-BIT LED DIGITAL TUBE: Shows moisture clearly. 3. Air humidity controller: built-in humidity correction function. 4. Robust shell design: waterproof and dustproof. 5.ACCURATE HUMIDITY CONTROL: Stable performance. Specification: Model No.: WH8040 Humidity measurement range: 1%-99%RH Humidity adjustment range: 1%-99%RH Measurement error: 0.03 Power supply: 220 V AC Current: Max.200mA. Data Retention: Yes Relay contact current: AC 5 A/220 V. Operating temperature: 0~50℃ Storage temperature: -10~60°C Size: 84 x 80 x 38 mm/3.3 x 3.1 x 1.5 inches. Package weight: approx. 212 g/7.5 oz. Package list: 1 x humidity regulator. 1 x temperature sensor probe with cable Package List