I wanted to get one for our little ones room. During the cold winter months, the house gets so dry. I run a humidifier often, but wanted to be able to see at a glance what the humidity is in his room. This is a GREAT size at a GREAT price! It displays both the Temperature and Humidity level. The range for humidity is 10-99 percent. The temperature range is 58-158 degrees fahrenheit. It is a great size being only about 1 inch by 2 inches. You can place almost anywhere. It does not display celsius. Temperature accuracy should be less than 2 percent, and humidity accuracy should be less than 5 percent. I love that the humidity sampling takes place every 2 seconds! Wow! This will be so helpful for our family so that we do not have to continuously run the humidifier. I can watch the humidity levels and use only when it gets too low. Thanks #AUTIDEFY for a great useful product at a great price! So happy with our purchase!