This patch thermometer sticker is 130mm long and 18mm wide, the temperature measurement range is 18℃~36℃. It displays on only Celsius with big size number, convenient for reading. It is a simple to use external stick-on thermometer for measuring the temperature of your reptiles vivarium. Adhesive at the back, just peel off the tape and attach to outside/surface of the enclosure. The thermometer changes colour according to the temperature. If the surrounding temperature is 20℃, then the numbers on the mark for 20℃ will turn colourful and the other numbers will remain black.