The Extech TP400 Type-K High Temperature Pipe Clamp probe produces a hands-free, super heat, and sub cooling temperature measurement. The spring-loaded jaw is for a secure grip on pipes from 6.35 mm (0.25 in) to 38 mm (1.5 in) in diameter. This probe is for use with any thermometer or multimeter with a Type-K thermocouple input. The measurement range is from -20°C to 232°C (-4°F to 450°F) with an accuracy of ± 1.8°C (3.6°F).