The sera aqua test-box is a profi test set for exact determining of 9 important water values in fresh water aquarium or garden pond. All important tests are included. The sera aqua-test box +Cu contains these water tests:-pH value-GH total hardness-KH carbonate hardness-NOnitrite-NOnitrate-NH4/NH3 ammonia/ammonium-PO4 phosphate-Fe iron-Cu copper-250 ml Sera aqua-dest, pure and clean water The sera aqua-test box +Cl contains these water tests:-pH value-GH total hardness-KH carbonate hardness-NOnitrite-NOnitrate-NH4/NH3 ammonia/ammonium-PO4 phosphate-Fe iron-Cl chlorine-250 ml Sera aqua-dest, pure and clean water