This is a medium length, durable insertion K-type thermocouple. The sensor is housed at the tip of a 6 inch (15 cm) long stainless steel probe. The diameter of the insertion probe is 3/32 inch or about 3 mm. The K Type thermocouple comes with a 3 inch long yellow plastic handle, which must be kept at room temperature (maximum is 160 degree Fahrenheit for the handle). It has a miniature type connector that will work with a digital K-type thermometer from many manufacturers (Nicety, Extech, Amprobe, TPI, REED and others). This probe can be inserted in liquids or any object you like to measure. It is much easier to clean than the thermocouple wire that comes with many digital LCD k-type thermometers. It is used in the laboratory, for science projects and research, and in many engineering and industrial applications, e.g. casting lead, measuring melts and liquids. In the HVAC trade it can be used to measure the temperature in ducts, the temperature of water and exhaust air, and of boilers. Home brewers use it to test for the correct temperature. Important: The temperature rating is for the tip of the probe, the handle and the cable are plastic and must be kept at room temperature during the measurement, they will otherwise melt.