Maintain safe and effective copper treatment levels with the API Copper Test Kit. Designed for freshwater and saltwater aquariums and ponds, this easy-to-use test kit accurately measures copper levels from 0 to 4 ppm, including both free and chelated copper. Regular monitoring helps ensure copper-based treatments remain within effective ranges while helping prevent harmful copper levels that may affect fish health. Use when treating parasites, adding new water, or monitoring aquarium conditions.