The Aquascape Copper Test Kit measures dissolved or chelated copper concetrations in ponds and aquariums. This easy-to-use kit provides accurate, labratory-quality testing that is simple to complete with the provided step-by-step instructions. Twenty-five tests are provided with each kit and all necessary components are included. Copper is often used as a fish medication or algae treatment, and it is important to monitor these levels when using copper as a treatment. The Aquascape Copper Test Kit is also ideal for testing tap water or source water for copper.