The Extech 392065 T-Bar Stem Thermometer offers two models to choose from for selection of Swivel or Fixed head feature, size and measurement ranges. The Swivel head (model 392068) features a range of-58 to 572°F (-50 to 300°C) with a larger size of 0.45" (11mm) LCD, and a 7.8" (198mm) probe that weighs 1.4 oz (40g). The Fixed head (model 392065) offers a range of -58 to 302°F (-50 to 150°C), a smaller size of 0.35" (9mm) LCD, and a 4.9" (124mm) probe what weighs 0.7oz (20g). Basic Accuracy of 2°F or 1°C 0.1° resolution to 199.9; 1° over 200° Model 392068 Moving head with adjustable viewing angle Wider measuring range to 572°F (300°C) Auto Off after one hour.