The Arctic Hayes 3 In 1 Thermometer is a pipe, infrared and stem thermometer, all in 1 instrument. Select measurement in °C or °F with a response time less than 1 second. The clamp opens to a max of 1in (25mm) approx. Other features include: max/min record, data hold & automatic power off function. Specification IR Temp. Range Temperature Range: -35°C to +260°C/-31°F to 500°F.IR Temperature Resolution: 0.1°C/°F.Optical Resolution 1:1 Distance to Spot Size.Thermistor Temperature Range: -40°C to +260°C/-40°F to 500°F.Resolution: 0.1°C/°FBasic Accuracy: 2% of Readings.