The digital thermometer hygrometer you've described is a versatile instrument designed for testing environmental temperature and relative humidity. Here are its features and specifications: Features: Combines the functions of a humidity meter, temperature meter, and time display. LCD display with backlight for easy reading, especially in darker environments, with an energy-saving auto-backlight-off function. Dual display of humidity and temperature with accurate measuring. MAX/MIN/data hold and data storage functions for convenient tracking of temperature and humidity variations. Low battery indication and auto power-off feature for energy-saving. Specifications: Material: ABS plastic Ambient Temperature: Range: -2060C (-4140F) Precision: 3C / 0.5F Resolution: 0.1C / 0.1F Relative Humidity: Range: 0~100%RH Accuracy: 3.0%RH Resolution: 0.1%RH Temperature Response Time: >2s (depends on the heat exchanging type) Humidity Response Time: 8s (time for humidity to stabilize under specified conditions) Screen Refreshing Time: 500ms Max/Min Temp/Humidity Alarm: Yes Max/Min Temp/Humidity Measurement: Yes Time Display: Yes Data Hold: Yes Data Storage: 100 groups Auto Backlight Off: 10 minutes Auto Power-off: 30 minutes Power Supply: 3 * 1.5V AAA battery (NOT included) Item Size: Approx. 188 * 64 * 27mm / 7.41 * 2.52 * 1.07in Item Weight: Approx. 126g / 4.47oz Package Weight: Approx. 288g / 10.18oz Package Size: Approx. 23.3 * 18 * 5.5cm / 9.18 * 7.09 * 2.17in Package Contents: 1 * Digital Thermo-Hygrometer 1 * User Manual (English)