The REOTEMP S1-F39 Magnetic Analog Surface Thermometer is a quality thermometer for use on ovens, boilers, process lines, motors or similar applications where a magnetically attached thermometer is needed. The thermometer features a glass lens that will not yellow over time and an easy-to-read 2.5" dial. The maximum rated temperature is 150F with an accuracy of ±3% full scale. This unit comes with a 1-year limited warranty.