Extech 392050 Pocket Style Stem Dial Thermometer is designed with a durable 5" (130mm) stainless steel probe with 2" (54mm) dial capable of measuring -58 to 302F (-50 to 150C), with +/-2F/1C accuracy, and 0.1/1 resolution. The Extech 392050 can measure air, liquids, and semi-solids, features an automatic shut-off, and simple ON/OFF switch to save battery power.