The DuraChoice T3D40250 bi-metal thermometer has a 3" dial size, with a 4" center back mounted stem. It features a stainless steel case with calibration dial, with 1/2" NPT connection. Measures 0 to 250 F (-20 to 120 C). Dual scale shows Fahrenheit/Celsius. Made for tight spaces and OEM applications. Calibration dial ensures accuracy.