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