Humidity detector has an automatic shutdown function which can save power. Even if you forgot to stop the instrument, the lockdown element by itself The Damp meter can be used for wood, walls, boats, wood, bricks, concrete, sawdust, wood chips and other materials Accurate ratings displayed quickly on a large digital hygrometer screen for a clear reading Moisture detector has an automatic shutdown function which can save power. Even if you forgot to stop the instrument, the lockdown item by itself This humidity tester has a data lock function that it can hold the measured value for registration and comparison Features Moisture tester Color: Yellow Material: ABS p Size: 147 * 49 * 23 mm Measuring range: 10-40% Resolution: 0.1% Moisture Effect: 70% Operating temperature: 0-40 deg; C (32-104 ° amp ;; F) Storage temperature: -10-50? (- 50-172 deg; F) Automatic shutdown: After 3 minutes of operation Data lock: Yes Note: 1. 1 inch = 2.54cm / 1cm and asymp ;. 0.393inch 2. Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind. Package including: 1 * humidity tester Note: this does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!