Review on Mini Digital Thermometer Hygrometer 4-Pack for Indoor Humidity Monitoring - Fahrenheit (℉) Temperature Humidity Gauge Meter - Ideal for Humidors, Greenhouses, Gardens, Cellars, Closets, Fridges, and More - by DWEPTU by Jill Flores

Small, compact, great size for me! Great price too. Arrived on time, with an extra set of batteries and double sided tape! Great offer! Use to install reptiles. I chose the 2 closest ones from the box according to the information and placed them in the terrarium on the warm and cold side. I'll leave them and check the readings later. The other two seemed to get closer together when I tested them after playing around with the first two, so I think it's very sensitive, but I can't figure out where the probe is until I put it on the side of the tank attach.