Thermocouple Thermometers Fluke 51 Handheld Digital Probe Thermometer Single-input digital thermometer for laboratories, QA, process calibration, food safety and HVAC Fluke 568 Contact and Infrared Thermometer Easily perform statistics and data analysis with the integrated FlukeView® Forms software 80PK-26 General Purpose Probe Type K thermocouple with a tapered tip for measuring air, non-caustic gases and surface applications.