Tel-Tru 381002AN Model Gt500R Resettable Bi-Metal Process Grade Thermometer, Stainless Steel, 5" Dial, 1/2" Npt Back Connection, 0.250" Diameter x 2.5" Long 304Ss Stem, -40/120 Degrees Fahrenheit and -40/50 Degrees Celsius, +/- 1% Full Span Accuracy