The main function including: temperature humidity and time simultaneously; 12-hour / 24-hour displaying system selectable clock clender date automatic changing desk-top placing or Wall Hanging. Indoor Thermometer Hygrometer is widely used for the measurement of the temperature and humidity in houses offices laboratory greenhouse schools warehouses production places etc. Three buttonss for function setting. It can show you temperature time and humidit. Memory or remove the maximum / minimum temperature and humidity. The display characters are bigger for more clear and comfortable reading.