Thermocouples and Temperature Probe test leads consist of a plug end and a tip end used when measuring temperature. The characteristics are type, usage, tip-type, plug type, and probe temperature range. The types are E-type thermocouple, J-type thermocouple, K-type thermocouple, T-type thermocouple, temperature probe, and thermistor used for measuring air, gas, gel, HVAC, liquids, surface, or semi-solids.