Feature: 1. [Non Destructive] This pinless humidity meter can penetrate up to 40mm into surfaces without damaging the surface or leaving any traces, providing non invasive humidity readings. 2. [Quick and User Friendly] Obtain accurate humidity readings in seconds. Simply press and hold the HOLD button for over 2 seconds for automatic calibration. 3. [Color Screen and Sound Prompt] The color screen and sound prompts make it easy to read and use, displaying temperature and humidity values simultaneously. 4. [Three Color Indicator] Features a three color analog bar for easy reading of humidity levels, with the ability to record current measurements using the HOLE button. 5. [Wide Range of Applications] Suitable for materials like gypsum, cementitious substrates, wood, paper, cardboard, tiles, and drywall, versatile and practical. Specification: Item Type: Wood Humidity Meter Material: ABS Screen: Color LCD display with backlit Principle: Pinless induction type Wood Range: 5-75% Paper Range: 5-75% Wall Range: 1.5-30% Temperature Range: 0-50℃ (32-122℉) Humidity Range: 0-80%Rh Resolution: Wood, Paper, Wall: 0.1%; Temperature: 0.1℃ (0.1℉); Humidity: 0.1%Rh Accuracy: Wood, Paper, Wall: ±2%; Temperature: ±2℃ (±4℉); Humidity: ±2%Rh Auto Power Off: Approximately 2 minutes later Calibration Function: Press and hold the HOLD button for more than 2 seconds Battery: 2 x AAA alkali dry battery (not included). Package List: 1 x Wood Humidity Meter 1 x User Manual