General Tools TPC20 K Type Pipe Clamp Thermocouple Probe with Extendable Cord General's Pipe Clamp is ideal for measuring temperature of steam pipes, heating elements, air conditioning coils and engine cooling hoses; Operating temperature: -58 to 900F Clamp jaw opening 3.5cm Measurement range: -58 to 900F (-50 to 482C) Measurement accuracy: 4.5F (2.5C) from -58 to 662F; above 662F accuracy is defined as: Reading( x) 0.0075 Clamp opening: 2.2 in. (55mm) max Extended length of cord: 6.5 ft. (2m)