A thermocouple is a device consisting of two different conductors (usually metal alloys) that produce a voltage proportional to a temperature difference between either end of the pair of conductors. Grounded type is more sensitive to temperature, can help to measure temperature fastly. K type Thermocouple with flexible spring built in. 2 terminals for easy connection. Temperature measurement range is from 0 celsius to 400 celsius degree. Widely used for industrial or laboratory to test equipments temperature. Product Name : Thermocouple Transfer Type : K Temperature Range : 0-400 Celsius Degree Thread Diameter : 8mm Probe Diameter : 5mm or 01" Fork Terminal Spacing : 4mm or 016" Probe Length : 200mm or 78" External Shielding : Metal Shield Length : 15m or 492Ft Color : Silver Tone material: metal Weight : 52g Package Content : 1 x Thermocouple Note:Light and different displays may cause the color of the item in the picture a little different from the real thingThe measurement allowed error is 1-3 cm.