Very Easy to operate, quick testing, obvious results. Simplest and cheapest way to test water quality. Buy for yourself and see the condition of your drinking water. The electronic color tester is an effective tool that visually demonstrates the difference between high TDS water and low TDS water. Features: Easy to operate and quick, with clear results. Provides a simple way to test water quality. Used to test water purity levels so users can observe the condition of their 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 rods into both cups, turn the device on and begin the test. After 30 to 60 seconds, turn it off and remove the electrolyzer. Caution: Avoid electric shock while using the device; do not touch the rods once the unit is plugged into a power outlet. Testing Analysis Results: Black: Heavy metals Yellow: Dissolved acids, fluoride, and other 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 dirt 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 03 cm error due to manual measurement. Ensure you are comfortable with this before purchasing. 3. Due to differences between monitor displays, the picture may not reflect the actual color of the item. Thank you! No retail package included Package Contents: 1 x Water Quality Testing Device