pH/ORP/ISE/ºC COMBINED DATA LOGGING BENCH METER, Range -2.00 TO 16.00 pH / ± 699.9 mV / ±2000 mV/ 0.001 TO 19999 ppm / -20.0 to 120.0 ºC, Accuracy of ± 0.01 pH / ±1mV / 0.5% F.S / ±0.4ºC, with Automatic Calibration in 1, 2 or 3 Points with 7 User Selectable Buffers, Manual or Automatic Temperature Compensation. Unit Comes With a pH Refillable Electrode Model # MA917B/1, Temp. Probe MA831R, Data Logging Software Mi5200, RS232 Cable included with USB Port, Electrode Holder, Starter Refill Electrolyte MA9011 (3.5kcl), Power Supply, Refill Pipette and Starter Calibration Solution