Handheld TDS Digital Water Tester Water Test Pen Water Quality Analysis Meter Water Purity Check 0-9999 ppm MeasurementDescription:Total Dissolved Solides (TDS) are the total weight of all solids (minetals, salts, or matals) that are dissolved in a given volume of water, expressed in milligrams perliter (mg/L), or in parts per million (PPM).Feature1. Hold function: Saves measurements for convenient readign and recording2. Auto-off function: Turns off meter after 10 minutes of non-use to conserve batteries.3. Measurement Range: 0-9999 ppm (When the measured value exceeds 999 ppm, please make the display value x10)SpecificationItem Type: TDS Water MeterMaterial: PlasticMeasurement Range: 0-9999 ppmAccuracy: +/-2%Temperature Range: 0-50 celsiusBattery: 2xLR44 batteries, 1.5VSize: 155x31x23 mmApplication1. Check the performance of your water filter.2. Check for nardness (1 grain = 17ppm).3. Make sure you always drink pure water!Please refer below standard for testing water0-50 ppm --------- High Purity Water50-100 ppm ------- Pure Water100-300 ppm ------ General Pure Water300-600 ppm ------ Fouling600-1000 ppm ----- Poor Taste Water,FoulingAbove 1000 ppm --- The water is not suitable for drinkingNoteBatteries are NOT included for safety!