range - infrared: -49.9 to 349.9°C range - probe: -49.9 to 299.9°C The Thermapen IR is two instruments in one compact unit, combining the advanced technology of two ETI designed and manufactured products, the RayTemp 2 Plus infrared thermometer and Thermapen 4 digital probe thermometer. infrared thermometer Simply aim the infrared thermometer at the target and press the scan button to display the surface temperature. Please Note: the infrared non-contact function will only measure when the probe is in the closed position. penetration probe Alternatively, it is possible to take liquid or semi-solid product temperatures using the reduced tip, stainless steel penetration probe (Ø3.3 x 110 mm). The probe conveniently folds back through 180° into the side of the instrument when not in use.