API COPPER TEST KIT 90-Test Aquarium Water Test KitContains one (1) API COPPER TEST KIT 90 Test Aquarium Water Test Kit, including 1 bottle of testing solution, 1 colour card and 1 glass test tube with cap Helps monitor copper and prevent invisible water problems that can be harmful to fish or treatments ineffective Accurately detects copper levels from 0 4 mg L Low copper level could make parasitic infections treatment ineffective Use for weekly monitoring, when water or fish problems appear and when