Tel-Tru 38100468 Model Gt500R Resettable Bi-Metal Process Grade Thermometer, Stainless Steel, 5″ Dial, 1/2″ Npt Back Connection, 0.250″ Diameter x 4″ Long 304Ss Stem, 50/550 Degrees Fahrenheit, +/- 1% Full Span Accuracy Review

The Model GT500R is the best 5″ 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.