Amazon.com : RUNBO Aquarium Test Strips 6-in
Aquarium Test Strips 6 in 1 is the optimum water test kit, one strip performs six important tests. In just one minute you will know your water's NO2, NO3, GH, KH, PH, Cl2 levels. The whole set contains one barrel and a refill pack, 100 strips in total. This product is suitable for fresh and saltwater fish tanks and ponds.
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