The 675 Series can be used for determining heat leakage from ovens, hot air ducts, and other installations. These thermometers can also be used for measuring the temperature of heat sinks, heat exchangers, laboratory heaters, platens, and hot plates. The 675 Series can be used for testing the temperature of electronic parts. An isotherm of an area can be constructed by employing several of these thermometers and then plotting the readings. PTC® Miniature Spot Check® Surface Thermometers are Made in the U.S.A.