The Fluke 80PK-8 Pipe Clamp Temperature Probe uses Type-K thermocouple for fast temperature and superheat measurements of pipe surfaces. The 80PK-8 Type K Thermocouple Pipe Clamp Temperature Probe is designed to reliably measure the temperature of pipes ¼-inch (6 mm) to 1 3/8-inch (35 mm) in diameter, at temperatures between -29 °C and 149 °C (-20 °F and 300 °F), while retaining a long service life.