Very easy to operate, quick testing with obvious results. A simple way to test water quality and observe the condition of drinking water. The electronic color tester is a tool that visually demonstrates differences between high TDS and low TDS water. Features: Easy to operate, fast testing with clear results Provides a basic method for testing water quality Used to assess water purity levels, allowing users to observe the condition of drinking water High precision Testing methods: Prepare two transparent cups of water (100 to 150 ml), one with tap water and the other with RO water. Insert the metal pillar into each cup, turn the device on, and begin the test. After 30 to 60 seconds, turn it off and remove the electrolyzer. Caution: Avoid electric shock during use; do not touch the rods when the device is plugged in. Testing Analysis Results: Black: Heavy metals Yellow: Dissolved acids, fluoride, and organic matter Green: Arsenic, mercury, lead, copper, sodium Blue: Bacteria, viruses, carcinogens, chemical fertilizers, pesticides, etc. Red: Iron, rust, and bacteria White: Lead, zinc, mercury, inorganic impurities Specifications: Plug: EU Plug Voltage: 220V Power cord length: 85 cm Iron bars length: 7 cm Size: 10.2 x 3.7 cm Quantity: 1 piece Note: 1. Transition: 1 cm = 10 mm = 0.39 inch 2. Please allow 0–3 cm error due to manual measurement. Ensure you are comfortable with this before purchasing. 3. Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you! No retail package included Package contents: 1 x Water Quality Testing Device