This is a great medium size insertion thermocouple with a K-Type sensor. The Type K sensor is housed at the tip of a 6 inch long stainless steel probe, which comes with a 3 inch long handle. It has a miniature type K connector that will work with digital K-type thermometers. This Type K stainless steel thermocouple has a wide range of applications in science, manufacturing and hobbies. In the laboratory it can be used to measure a wide range of temperatures of gasses or liquids. It can be inserted in semi-solid materials such as powders, paste and soil. It frequently is used for science projects in school, college and university labs. In industrial applications it is used for manufacturing, in the HVAC trade to measure air and liquid temperatures. In the hobby range it is used for brewing, distillation and extraction and maker projects. I frequently have customers who buy this for measuring the temperature of molten lead in bullet casting, frequently with Lyman casting kits, but also for molten brass and aluminum. The sensor is about 1/4 inch from the tip. The tip can be inserted about 1 inch into the molten lead to get you a good temperature reading. It is important to keep the handle and cable at room temperature.