This is a small size and inexpensive insertion thermocouple with a K-Type sensor. The sensor is housed at the tip of a 3 inch long stainless steel probe, which comes with a 2 inch long plastic handle. The handle needs to be kept at room temperature. The maximum rating is 752F ( 400C ) at the tip of the stainless steel part, with the handle at room temperature. It has a miniature type connector that will work with digital K-type thermometers. 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 thermometers. This is for a set of 2 of the thermocouples, you save $2 on the single price.