One high accuracy multi-range sensor measures four parameters (Conductivity, TDS, Salinity and Temperature)Auto ranging meter offers 3 ranges to measure from pure water to salinity solution to waste, boiler and cooling water using the same conductivity cel6 units of measure: µS/cm, mS/cm, ppm, ppt, mg/L, and g/L Internal memory stores up to 15 labeled readings for easy recallAdjustable Conductivity to TDS ratio factor from 0.4 to 1.0Self calibration on power up