A thermocouple is a device that consists of two different conductors (usually metal alloys) that produce a voltage proportional to a temperature difference between each end of the conductor pair. The grounded type is more sensitive to temperature and can help measure temperature faster. 5 x 50 mm PT100 thermocouple sensor with built-in flexible spring. 3 terminals for easy connection. The temperature measurement range is 0 Celsius to 400 Celsius. Widely used in industry or laboratory to test the temperature of equipment. Product Name: Thermocouple Probe Type: PT100 Type Temperature Range: 0C-400C Sensor Size: 5 x 50 mm / 0.2 x 2 inches (D x L) Fork Pin Size: 9 x 5 mm / 0.4 x 0.2 inches (L x W) Pin Pitch: 3 mm / 0.1 inches Outer Shield Protection Material: Metal Total Length (Approx.): 2M / 6.6 feet Color: Tone Material: Metal Weight: 46g Package Contents: 1 x Grounded Thermocouple Probe Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.