[Easy operation] This water electrolyzer is easy to operate. Install the iron bars and aluminum bars, place them into the water to be tested, plug in the device, turn on the switch, and wait for the testing result to appear. After testing, turn off the power switch. [Working principle] The water electrolyzer applies an electric field in water using two electrodes made of iron and aluminum rods. When energized, positive ions are released from the iron rod and react with negatively charged ions in the water, forming insoluble metal clusters. These clusters coalesce and adsorb colloidal, organic, and inorganic substances present in the water. [Working principle] Due to the electric current, dissolved metal particles such as lead, chromium, manganese, potassium, cobalt, and others are reduced and gradually form visible metal clusters. Color changes may occur due to the different characteristics of the metal ions. [Note] After turning on the power, do not touch the electrodes or place fingers into the test water. Keep the device away from children. After use, dry the electrodes with a clean, dry cloth and wipe the iron rod with fine gauze before storing properly. Plug Type: US Plug, compatible with countries including Canada, India, Mexico, Thailand, Taiwan, and the Philippines. Voltage: AC 110V Color: As Shown Material: Plastic + Metal Package Contents: 1 x Water Quality Tester Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.