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 and automatic power off function. Specification IR Temp. Range Temperature Range -35C to +260C/-31F to 500F. IR Temperature Resolution 0.1C/F. Optical Resolution 11 Distance to Spot Size. Thermistor Temperature Range -40C to +260C/-40F to 500F. Resolution 0.1C/F Basic Accuracy 2% of Readings.