ATC1 jaw range: 3/8" to 1 3/8" pipe diameter (outside diameter) Accuracy: +/- 4F (2C) ; +/-1F (0. 5C) after field calibration, 32 to 176F (0 to 80C) Temperature range: -50 to 257F (-46 to 125C) Thermocouple conductors: K-type nickel chromium/nickel aluminum. Plug: K-type thermocouple male mini plug., Manufacturer: Standard Plumbing Supply