FUNCTIONAL RANGE: Indoor temperature, test range 0 ~ 70 , indoor humidity, detection range: 20% -99%, inspection cycle: 10 seconds, display of the maximum / minimum data for indoor temperature and humidity on the same screen.HIGH SENSITIVITY AND ACCURACY: The thermometer hygrometer uses a sensitive electronic chip, and there are 8 ventilation holes on the surface of the thermometer, which can effectively contact the air and thus accurately and effectively analyze the air data.TEMPERATURE AND HUMIDITY MEMORY FUNCTION: In the standard mode, short press the MEMORY TIME: key, you can switch to record the maximum / minimum temperature and humidity of all time periods, or the maximum / minimum temperature and humidity within 24 hours, long press the MEMORY TIME: key to clear the maximum / minimum memory value of all current temperature and humidity. .ENVIRONMENTALLY FRIENDLY ABS MATERIAL: The thermometer and hygrometer housing is made of environmentally friendly ABS material, which is suitable for long-term use without pollution or odor. After contact with moisture and stains, the color does not turn yellow and is easy to clean.