Accuracy varies with thermocouple thermometers, but can measure to within a few tenths of a degree. Here is some additional information about Amprobe Thermocouple Thermometer. Includes: (2) K Type Thermocouple Probes, Instructions, Carrying Case, Accuracy: +/-(0.05% 1.4 Degrees F), Temp Range F : Type K -328 Degrees to 2498 Degrees , Type J -328 Degrees to 1922 Degrees.