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 1/4 in to 1-3/8 in diameter, at temperatures between -20 deg F and 300 deg F, while retaining a long service life.