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 800 celsius degree. Widely used for industrial or laboratory to test equipments temperature. Product Name : Thermocouple Transfer Type : K Thread Diameter : 8mm / 3.1 inch Probe Diameter : 5mm/ 0.1 inch Fork Terminal Spacing : 4mm / 0.16 inch Probe Length : 50mm/ 2 inch External Shielding : Metal Shield Total Length : 3 Meters / 9.8Ft Color : Silver Tone Material:Nylon Braided Cable + Metal Weight : 200g Package Content : 4 x Thermocouple Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.