The TDS is the total weight of all solids that are dissolved in given volume water ,express in milligram per liter (mg/L),or in parts per million (PPM). The TDS meters are used to test water quality and is the simple and effective way to make sure whether you always drink pure water. Specification: Range:0-9,990 ppm Accuracy:+/-2% Battery:2*1.5v (button cell) Size:140*23*15mm Weight:32g
