Tel-Tru 341006AN Model Gt300R Resettable Bi-Metal Process Grade Thermometer, Stainless Steel, 3" Dial, 1/2" Npt Back Connection, 0.250" Diameter x 6" Long 304Ss Stem, -40/120 Degrees Fahrenheit and -40/50 Degrees Celsius, +/- 1% Full Span Accuracy