TPI 306C Auto Field Calibrated Pocket Digital Thermometer with Penetration Tip, Protective Boot, and 5" Stem, -40 to 300 Degrees F, Accuracy of + or - 1% of Reading Digital thermometer for monitoring temperature in food service, electrical testing, and heating, ventilation, and air conditioning applications Measures temperature from -40 to 300 degrees F with an accuracy of + or - 1% of the reading Thermometer can be calibrated in an ice bath to preserve the accuracy of readings LCD screen shows the current temperature in degrees F Stem-style probe is 5" long and has a penetration tip for taking measurements while immersed in liquid or air