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 0.25 inches (6.35mm) to 1.5 inches (38mm) in diameter. This probe is for use with any thermometer or multimeter with a Type K thermocouple input. The measurement range is from -4 to 450°F (-20 to 232°C) with an accuracy of ±3.6°F (1.8°C).