Electric Conductivity Meter, TDS Range 0 To 999.9 ppm, 1.000 To 400.0 g/L, Electric Conductivity Range 0.001 To 999.9 uS/cm, 1.000 To 1000.0 mS/cm, Salinity Range 0 To 400.0%, 0 To 80 PSU, 0.01 To 42 PSU, Display Backlit Graphic Dual level, Auto Power Off, Automatic Calibration, Power Source 4 AA Rechargeable Batteries, Includes Probe, Batteries, Battery Charger, And Instructions