Copper is a treatment for many parasitic infections it must be monitored in an aquariums. The copper levels can drop too low for the treatment to be effective, or can increase to a point that is detrimental to fish health. Copper can even be found present in tap water.
With Copper test kits you can easily and accurately monitor copper levels to maintain copper-based fish treatments at therapeutic levels, and tests copper levels in your fresh or saltwater aquariums.