Ray-JrMALL White Hygrometer New LCD Digital Temperature Humidity Meter in/Outdoors This tool will allow you to control the humidity level and temperature of home and away. Place the instrument in a room and after 5-10 minutes will give you a stable reading of current conditions. You can then use the readings to adjust the air conditioner or humidifier for your needs in every room. Temperature reading in Celsius or Fahrenheit. Function to store the maximum and minimum values.