A function overview:1. The LCD display2. The diameter of the opening TAMANHO is 41mm (the measurement has a small error)3. External diameter 45.2 (small measurement error)4. Weight: 25g (battery not included)5. Humidity display6. Humidity measurement range 10% ~ 99%7. Humidity display resolution 1%8. Humidity sampling period of 10 seconds (1 minute)9. Humidity measurement accuracy 5%Rated voltage DC1.5V (1 AG13 button battery)11. Temperature measurement range -50 to 7012. Temperature measurement accuracy 1 degree (at room temperature)Two. Battery installationFlip 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 compartmentInstallation 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 Productcontact Us.we Will Give You The Best Solution."