The Mondi Mini Thermo-Hygrometer measures temperature and humidity. It can be used as a standalone unit, or it can be mounted to the outside of your propagation dome for reading temperature and humidity inside the dome. Measures temperature between 15.8 and 122 degree and humidity between 25 and 98 RH. It also has a memory that records min/max temperatures and humidity. Comes complete with battery and dome mounting drill bit.