The Cosystove stove pipe thermometer is the perfect companion for a heat powered stove fan to ensure it stays at the correct temperature. It can be used as an energy meter to determine when your stove is performing at its most efficient.Save money by increasing the efficiency of your stove and using less fuel to achieve the ideal temperature. It attaches magnetically and features a simple 3 zone meter to indicate ideal temperature, as well as overheating and underheating zones. Use this thermometer in tandem with a stove fan to monitor you stove's temperature and ensure the fan isn't damaged by overheating.