Tel-Tru 34100664 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, 50/500 Degrees Fahrenheit, +/- 1% Full Span Accuracy Review

The Model GT300R is the best 3″ dial back connected thermometer for heavy duty applications. The unique stem groove to identify the min. immersion for accurate reading. Glass window that is fully gasketed.