Portable waterproof pH EC TDS metre (high range) HI991301 can measure total dissolved solids (TDS), electrical conductivity (EC), and pH in a variety of samples. It has a high-range EC/TDS sensor that can detect TDS up to 10 ppt and conductivity up to 20 mS/cm. The pH scale runs from 0.00 to 14.00. This metre has a changeable electrode that can be quickly changed out as necessary and a big, simple-to-read LCD screen that shows measurements and readings. The portable waterproof pH EC TDS metre (high range) HI991301 can be used when dealing with liquids or in challenging conditions because it is waterproof.