These rods are also suitable for use in educational settings, where they can be used to demonstrate the principles of electromagnetism and electrolysis. Their construction and materials make them suitable for repeated use, ensuring that students can conduct experiments safely and effectively. Features -Color:Assorted Color -Material:Iron, Aluminum -Size:7.00X0.80X0.80cm/2.75X0.31X0.31in -Precise and reliable: this water quality electrolyzer rod offers accurate water purity measurements, ensuring you have dependable information about your drinking water -Sturdy construction: made from iron and aluminum rods, this electrolyzer rod is designed for durability and long term use -Wide range of applications: suitable for use in homes, offices, hotels, and more, this electrolyzer rod is versatile and adaptable for different water sources -Portable and convenient: its compact and lightweight design makes it easy to transport, allowing you to test water quality on the go or during travel -Complete set included: each electrolyzer comes with iron rods and aluminum rods, providing complete for water quality testing Package list: 2pcs aluminum rods, 2pcs iron rods