Tel-Tru 34100214 Model Gt300R Resettable Bi-Metal Process Grade Thermometer, Stainless Steel, 3" Dial, 1/2" Npt Back Connection, 0.250" Diameter x 2.5" Long 304Ss Stem, 0/250 Degrees Fahrenheit and -20/120 Degrees Celsius, +/- 1% Full Span Accuracy