This is a k-type thermocouple wire with yellow braided fiberglass insulation, which is good up to about 400 °C Celsius or 752 °F Fahrenheit. This k-type thermocouple wire can be used to make your own Type K thermocouples for a wide range of applications, or to make your own type k extension wire. K-type thermocouples are made from chromel / alumel wire, this K-type wire is made to standard K-type thermocouple specification. The thermocouple wire has a double fiberglass insulation, with the inner insulation color coded to ANSI K-type colors, which are yellow for + and red for -. It is sold in 10 yard (30 ft) rolls. K-type thermocouples are used in many scientific and industrial applications, they can be used to measure oven, furnace and kiln temperatures. They can be attached to objects like pipes or machine parts. K-type thermocouples can also measure non corrosive liquids.