Exo Terra 100W Electronic ON/OFF Thermostat (Model PT2456).

I have 2.. 1 for $30 or 2 firFor $50 What it does: ​Temperature Control: It allows you to set a specific temperature range for your habitat. You plug your heating device (like a heat mat, heat cable, or ceramic heat emitter) directly into the thermostat. ​Automatic Regulation: Using a waterproof remote sensor placed inside the enclosure, it monitors the temperature and automatically turns the heating device on or off to prevent overheating or undercooling. ​Ideal Use: Because it is an "on/off" type thermostat, it is best suited for devices like heat mats, which do not mind being cycled on and off. It is generally recommended for maintaining environmental conditions for desert or tropical species.