Water Quality Tester with Digital EC Meter with Measuring Range 0-9990ppm NewInstrument Features:This item can be used in: water purifiers and filters, food (vegetable, fruit) and beverage quality monitoring, swimming pools and spas, aquariums, hydroponics.Hold function: Stores measurements for convenient reading and recordingMeasurement range: 0-9999ppmAccuracy: 2% NW: 23g Size: 20 x 20 x 150 (mm)Introduction of the total dissolved solids value:XPPM: 1 liter of water contains X mg of dissolved solids0-50, high purity;50- 100, high purity;100-300, medium purity;300-600, will catch scale;600-1000, bad taste;< /p>Above 1000, not suitable for consumption.Use step:Please unplug the electrode protective sleeve before use .Press the switch, place the electrode in the test solution.After the digitally stable.press the button and take it out of the solution to be read.After reading, turn off the meter. wipe the electrode before sheathing.Package includes:1 X Water Quality Tester