API 3 Pack of Carbonate KH Test Kits for Fresh and Salt Water Aquariums beauty_2021 and practice

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API 3 Pack of Carbonate KH Test Kits for Fresh and Salt Water Aquariums beauty_2021 and practiceAPI 3 Pack of Carbonate KH Test Kits for Fresh and Salt Water Aquariums Tests tap water & fresh or saltwater aquariums for carbonate hardness (KH). Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH. Product Information Liquid test for fresh and saltwater Helps detect stress on fish caused by rapid pH shifts, the result of low KH levels Contains color chart, clear instructions and glass tube(s)