The Baker 314FC surface thermometer is specifically designed to be used on horizontal or ferrous surfaces. It features two alnico magnets that act as the thermometer’s base and hold it in place and the Bimetallic sensor is a specially processed alloy that is preconditioned and pretested for permanent calibration and maximum stability. The sensor is located in a draft shield and is in virtual thermal contact with the surface to be measured which means a relatively quick response time and it reaches sensing equilibrium (stability) within three minutes. It is designed for applications such as: hot plates; griddles; die-cast dies; foundry core boxes; annealing ovens; weld preheats; motors; generators; engines; bearings; boilers, tanks, and drums. This product includes a calibration certficate traceable to NIST (National Institute of Standards and Technology). Please note you may receive a "REED" branded product which will be the exact same product as shown in this listing.