Fluke 80PK-18 Pipe Clamp Temperature Probe Kit Type-K thermocouple for fast temperature and superheat measurements of pipe surfaces Durable patented ribbon sensor with protective cover when not in use Measurement range is -20 to 300 Degree Fahrenheit (-29 to 149 Celsius) For pipe diameters: 1/4 to 3/8-Inch (6 to 35 mm) and 1.25 to 2.5-Inch (32 mm to 64 mm) Includes: 80PK-8 and 80PK-10 Pipe Clamp Temperature Probes