Features with 2.7meters long, 7.8mm thread diameter, 15cm probe length thermocouple. 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 fast. 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 equipment's temperature.