s:Very Easy to operate , quick testing, obvious results. simplest and cheapest way to test the water quality. buy yourself & see the condition of your drinking waterThe electronic color tester is an effective sales tool that visually demonstrates the difference between high TDS water and low TDS water Features:Easy to operate and quick, obvious to get result Provides a simple way to test water quality Provide us with the simple and cheap way to test water quality.Used to test the water purity level,the client can see the condition of drinking warterHigh precisionTesting methods: Prepare two transparent cups of water (100 to 150 ml ) one cup holds tap water, the other cup holds RO water. Put metal pillar into two cups, turn ON and begin the test, After 30 to 60 seconds, turn it off and remove the water electrolyzer. Caution: Avoid the electric shock while using the devise; Do not touch the rods once the precipitator is plugged into an electric 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 PlugVoltage: 220VPower cord length: 85 cmIron bars Length: 7cmsize: 10.2x3.7cmQuantity: 1 Pc Note:1.Transition: 1cm=10mm=0.39inch2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid.3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank youNo Retail PackagePackage Contents:1 x Water Quality Testing