Keep your fish healthy and thriving by testing your aquarium water's copper levels regularly with this easy-to-use API COPPER TEST KIT for aquariums. API COPPER TEST KIT allows for the fast, easy, and accurate measuring of copper levels in fresh and salt water, which is particularly necessary for effective parasitic treatment for diseased fish. A low copper level could make the treatment ineffective, whereas a high copper level could cause fish death. Kit reads Copper levels 0 - 4 ppm and contains 1 Copper test solution bottle, one instructional booklet, one capped glass test tube, and one color card. In order for fish to thrive, water must be similar to that which could be found in their natural environment. Poor water quality can cause fish stress, illness, and even loss.