Fluke 54-2 Dual Input Digital Thermometer with USB Recording, 3 AA Battery, -418 to 3212 Degree F Range, 60 Hz Noise Rejection Fluke 54 II B dual input digital thermometer can log up to 500 points of data to internal memory. Fast response and laboratory accuracy (0.05% + 0.3C). Buy N Large backlit dual display shows any combination of T1, T2 (52 and 54 only), T1-T2 (52 and 54 only), plus MIN, MAX, or AVG Recall function allows logged data to be easily reviewed on the meter display Infrared USB communication port allows data to be exported to optional FlukeView Forms Temperature PC software for further analysis and graphing Data Logging up to 500 points of data with user adjustable recording interval