Fieldpiece ATR1 Piercing K-Type Thermocouple for Ventilation Ducts Rod length: 475-Inch Rod diameter: 0125-Inch Thermocouple cable length: 4 feet Temperature range: -238-Degree F 1472-Degree F (-150-Degree C 800-Degree C) Thermocouple conductors: K-type nickel chromium/nickel aluminum