Fangrui Product Details 1. Wintact Wt83b Bluetooth Digital Humidity & Temperature Meter 2. Features 3. Lightweight And Portable, Stable Performance, Temperature And Humidity Can Be Measured. 4. Built-in Bluetooth, Which Can Be Connected To Mobile Phones And Controlled By App. 5. Support Dew Point Temperature Measurement, Wet Bulb Temperature Measurement, High Accuracy, Low Power Consumption. 6. The Lcd Screen With Backlight Allows Data To Be Read Even In A Dark Environment. 7. Suitable For Factories, Laboratories, Warehouse Management, Food Hygiene, Air Conditioning Systems, Etc. 8. Specification 9. Material: Abs 10. Ambient Temperature Range: -20 Degree C~70 Degree C (-4 ~ 158 Degree F) 11. Ambient Temperature Accuracy: +-1degree C 12. Humidity Range: ~ Rh 13. Humidity: Accuracy +- Rh 14. Dew Point Range: -20 Degree C ~50 Degree C 15. Dew Point: Accuracy +-2 Degree C 16. Wet Bulb Range: -20 Degree C ~50 Degree C 17. Accuracy Of Wet Bulb: +-2 Degree C 18. Power Supply: 3 X 1.5v Aaa Battery (battery Not Included) 19. Bluetooth Communication (application): Support 20. Record 999 Sets Of Data: Support 21. Degree C Degree F Selection: Support 22. Data Retention Display: Support 23. Upper Valuelower Value: Support 24. Automatic Shutdown: Support 25. Alarm Setting: Support 26. Automatic Shutdown: Support