Salifert Copper Test Kit provides precise measurement of dissolved and weakly chelated copper levels in both freshwater and saltwater aquariums, ranging from 0.05 to 2 mg/L. Copper treatments are commonly used to combat parasitic infections in fish, but excessive concentrations can harm sensitive marine species and invertebrates. Since tap water may naturally contain copper, regular testing is essential for maintaining safe water conditions. This highly sensitive and reliable kit enables you to monitor copper levels weekly and verify proper dosing after treatment applications. Each pack contains enough reagents for 50 accurate tests, making it an economical choice for serious aquarists committed to precise water chemistry management.