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![Amazon.com : EASYTEST [150 Strip] [3 in 1] Aquarium Test Strips, [Freshwater and Saltwater 2 in 1] Test kit Monitoring Total Hardness, pH, Carbonate : Pet Supplies](https://m.media-amazon.com/images/I/716Pgc7jniL._AC_UF1000,1000_QL80_.jpg "Amazon.com : EASYTEST [150 Strip] [3 in 1] Aquarium Test Strips, [Freshwater and Saltwater 2 in 1] Test kit Monitoring Total Hardness, pH, Carbonate : Pet Supplies")