[Easy operation]This water electrolyzer is easy to operate, just install the iron bars and aluminium bars then put into the water you want to test, turn on switch after plugged in, about later, turn off the power switch, the testing result be shown. [Working principle]Water electrolyzer is an electric field placed in water, consisting of positive and negative two electrodes (iron and aluminum rods). After being energized, the + ions with positive charge are released from the iron rods and react with the negative valence ions in water to produce insoluble metal clusters, while coalescing and adsorbing the gums, organic and inorganic substances in water. [Working principle]And due to the action of electric current, the metal particles dissolved in water, such as lead, , chromium, manganese, potassium, cobalt, etc., are reduced out and gradually gathered into metal clusters, which produce color separation due to the different color rendering of different metal ions. [Note]After turning on the power, hands should not be grasped on the electrode; fingers should not be put into the test water; do not let children play with the electrolyzer. After using the electrolyzer, dry the electrode with a dry cloth and wipe the water on the iron pole with a fine gauze and keep it properly. Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. Voltage: AC110V Colour:As Shown Material:plastic+metal Package Contents: 1 x Water Quality Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.