Test Meter, pH/TDS/Conductivity/Salinity Pen, pH Range 0.00 to 14.00, Electric Conductivity Range 0 to 19.99 mS/cm, TDS Range 0.1 ppm (mg/L) to 9.99 ppt (g/L), Waterproof Yes, Automatic Temperature Compensation Yes, Displayed Temperature Range 0...