Tel-Tru 41100268 Model Aa375R Resettable Bi-Metal Process Grade Thermometer, Stainless Steel, 3" Dial, 1/2" Npt Adjustable Angle Back Connection, 0.250" Diameter x 2.5" Long 304Ss Stem, 50/550 Degrees Fahrenheit, +/- 1% Full Span Accuracy