pH/mV/EC/TDS/NaCl/°C COMBINED WITH DATA LOGGING; Automatic Calibration in 1, 2 or 3 Points with 7 User Selectable Buffers, Manual or Automatic Temperature Comp. Unit Comes With a pH Refillable Probe Model # MA917B/1, with MA813D/1 EC Probe, 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