Extech EC400 ExStik Waterproof Conductivity, TDS, Salinity, and Temperature Meter

6 selectable units of measurement--mS, mS, ppm, ppt, mg/L and g/LAutomatic temperature compensationAutomatic self calibrationStores/recalls up to 15 labeled readingsAdjustable conductivity to TDS ratio factor from 0.4 to 1.0EXTECH ExStik ConductivitBrand: Extech, Model: EC400