A function overview: 1. The LCD display 2. The diameter of the opening size is 41mm (the measurement has a small error) 3. External diameter 45.2 (small measurement error) 4. Weight: 25g (battery not included) 5. Humidity display 6. Humidity measurement range 10 percent - 99 percent 7. Humidity display resolution 1 percent 8. Humidity sampling period of 10 seconds (1 minute) 9. Humidity measurement accuracy 5 percent Rated voltage DC1.5V (1 AG13 button battery) 11. Temperature measurement range -50 to 70 12. Temperature measurement accuracy 1 degree (at room temperature) Two. Battery installation Flip to the back of the product Push the battery cover in the direction indicated by the arrow Place two LR44 button batteries in the battery compartment Installation and operation: embedded installation "all Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem Or You Are Not Satisfied With The Product contact Us. we Will Give You The Best Solution." All Products From Us Have Undergone Strict Quality Checks. If There Is Any Quality Problem Or You Are Not Satisfied With The Product Contact Us. We Will Give You The Best Solution. All Products From Us Have Undergone Strict Quality Checks. If There Is Any Quality Problem Or You Are Not Satisfied With The Product Contact Us. We Will Give You The Best Solution.