The ventilation holes of the product should not be submerged in water. After the product is attached to the wall, do not violently remove it to avoid damaging the product or the surface of the wall. Please keep from the harsh environment of high humidity. This product is used for , not as a measuring tool. Product parameters: Product model: Multifunctional mini temperature and humidity meter Battery type: CR2032 (installed) Temperature measurement range: -50C-+70C (-58F-+158F) Temperature Measurement Accuracy: +1C (1.8F) Temperature Resolution: 0.1C (0.2F) Humidity measurement range: 10%RH-99%RH Humidity measurement accuracy: 5%RH Humidity resolution: 1% Features: Indicator High Accuracy and Quickly Refresh Multiple Mounting and Widely Use Easy To Read and Use size: 43 x 13mm Material: ABS colour: White Package Contents: 24 x Thermometer hygrometer(Battery included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.