Thermocouple Thermometer, RTD, Thermocouple, Number of Channels 4, Includes NIST-Traceable Certificate No, Accuracy +/-0.44 Percent +1.8 Degrees F (1,000 Degrees to 1,562 Degrees F), +/-0.4 Percent +1.8 Degrees F (RTD: -327 Degrees to 999 Degrees F/-200 Degrees to 537 Degrees C), +/-0.4 Percent +2 Degrees F (Thermocouple: -328 Degrees to 2,498 Degrees F/-200 Degrees to 1,370 Degrees C)