Salifert's Copper Profi Test Kit is perfect to monitor copper levels within your aquarium.
Copper is often found in treatments and medications, so it's important to check that the concentration is not too heavy as it can be toxic to both marine fish and invertebrates. Tap water can also contain a large amount of copper and other heavy metals, so test mains water during water changes.
This kit contains enough solution to carry out 50 tests and should be used as part of your regular maintenance routine to keep the tank in the best condition. It is very sensitive and will detect the smallest amount easily.