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API® High Range pH Test Kit — 160 Tests The Pond Digger Locking button and twist coreAPI High Range pH Test Kit monitors pH changes in marine aquariums, aquariums with African Cichlids, and very alkaline tap water. It is fast, accurate and easy to read, working in pH ranges from 7. 4 8. 8. Use it during regular care, when diagnosing problems, or before using certain water treatments. pH can naturally fluctuate do to fish waste, the addition of water and the build up of natural acids. Use this kit to accurately measure pH levels. Take