This unique portable thermometer displays data from 4 thermocouple probes simultaneously on a large back-lit LCD. Communicates with a computer via the bi-directional computer port and optional cable, and graphic software. Auto ranging with auto power off, min/max, hold, Δ (T1-T2) and relative functions. High full scale accuracy of ±0.5% rdg. + 1ºC / 2ºF. Easily calibrates to ice point, or any other standard. 0.1° resolution <200° & 1° >200°C. Wide measurement range of -328 to 2498°F (-200 to 1370°C). Comes ready to use with 2 beaded wire probes, instructions, and a 9V battery, in a protective, foam-lined case. Can also be used with optional AC Adapter (800003). N.I.S.T. traceable Certification Report available.