Features: Portable Water Electrolyzer with 4 Detachable Metal Rods Quickly test water purity in tap, well, seawater, or aquarium with instantly electrolysis results, featuring a leak proof design for safe operate. Equipped with an ABS built housing and plug and play functionality, this compact electrolysis water test device delivers clear visual analysis within 30 seconds through its rustproof metal probes. Ideal for homeowners, educators demonstrating water chemistry, and aquaculture professional requiring on site water quality assessments. Use in homes to check drinking water safety, classrooms for science experiments, or outdoor adventures to evaluate natural water sources. Simplified operate Insert probes into two half filled water samples, power on, and observe color changes to identify contaminants effortlessly. Specifications: Component: ABS Color: White Size: Approx. 9.9x10.5cm/3.89x4.13in Weight: Approx. 200g Package Includes: 1Piece Portable Water Electrolyzer Tester note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color