thermo-hygrometer Check the temperature and relative humidity in greenhouses, clean rooms and walk-in coolers with the Jumbo Display Thermo-Hygrometer. It features °F/°C switch and minimum/maximum memory buttons. [Brand Story]MIEO Indoor Thermometer & Hygrometer MIEO is an international brand which always holds the concept of cherishing environment, healthcare, and the transmission of happiness. It keeps pace with people's lifestyle and quality of life, provides health and happy electronic products. [Product Feature] Measure indoor temperature and humidity Temperature measuring range:-10°C +70°C Humidity measuring range:20% 90%RH Max/Min temperature/humidity memory Use one AA 1.5VDC battery [FAQ] Q: why results are the same when we moved outside? A: When the Thermometer & Hygrometer was removed from the house, it is not adapted to the environment, so display the same. The solution is placing it outside for a few minutes to adapt the environment, then you can get a correct value. [Kindly Reminder] To protect the measurement accuracy and stability of Humidity sensor, you’d better avoid putting it in acid, alkali atmosphere, or blind place, or place with heavy dust.