Description: The digital TDS meter tester is used for testing the filter water quality purity, to check the performance of your water. In order to make sure you always drink pure and safe water, the TDS meter tester is recommended for every family. Features: Made of high quality and durable material, simple design of one switch, easy to use. The TDS meter tester can be used in: water purifiers and filters, liquid food (vegetable, fruits) & drink quality monitoring, pools and spas, aquariums, hydroponics etc. The 4 electrolytic bars (2 iron bars, 2 aluminum rods) are 2 group positive and negative poles (each group has a positive pole and negative pole). It can test two different liquid at one time, convenient to use. Using this item can help you test all kind of impurities in water by shows different color. There are 6 colors (yellow, green, blue, red, white, black) to indicate the different object in water, and only the yellow color shows that water is health. Applicable industries: water laboratories, CDC, the aquaculture industry, hospitals, swimming pools, household tap water quality testing. Testing Method: (1)Preparing testing water--get two 100-150ml white glasses, one glass full of tap water, and the other full of R/O water. Then put them on the desk side by side. (2)Preparing for testing--put the tester lying on the glass, plug in 220V power (3)Testing--push the power switch of tester into ON, start to test (4)Normally, the testing time is 30 seconds. When it's over, push the OFF button and take the tester out. Testing Standards: (1)Not contain any materials smelly or harmful to human bodies (especially heavy metal and organics) (2)Appropriate water hardness, usually ranging 50-200mg/L. (3)PH value shows alkalescence (7.0-8.0). (4)The content and proportion of microelement and mineral substance of water is moderate, close to normal solution. (5)The dissolution content of oxygen and cardon dioxide in the water is moderate (dissolved oxygen in water ≥6-7mg/L). (6)Strong nutrition and physiology function (including dissolution capacity, penetrability, diffusibility, metabolization capacity, emulsifying capacity, detergency etc. Specification: Condition: 100% Brand New Color: Shown as picture Voltage: 220V Plug Type: EU Plug Package Weight: 180g Package Included: 1 x Water Quality Tester Note: (1)After power on, please don't put hands on the electrode (2)Don't put your fingers into the testing water (3)Keep your children away from tester. After using, please use dry cloth to wipe the electrode and wipe the water on iron pole with gauze, then conserve it carefully (4)The second and forth metal sticks on the detector are ironed, and rust easily. We kindly advise you to wipe the water on them. (5)Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Dear customer, please rest assured to buy without worrying about the plug adaption. We will provide an adapter for you according to different country standard and ensure its normal use. .