Features: Tests drinking water purity to ensure it is healthy. Visually demonstrates the difference between high TDS water and low TDS water. Simple to operate with quick testing for clear results. Suitable for use with purified water, drinking water, tap water, well water, seawater, and aquarium water. A practical tool to help maintain family health by monitoring water quality. Specifications: Material: ABS + Metal. Body Size: 100 x 70 x 42 x 30mm / 3.94 x 2.76 x 1.65 x 1.18in. Cable Length: 800mm / 31.5in. Testing Method: Prepare two transparent cups of water (100 to 150ml), one with tap water and the other with RO water. Insert the metal electrode 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. Package Includes: 1 x Electrolyzer Note: Please allow 1-3cm error due to manual measurement. The image may not reflect the actual color due to monitor differences.