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❥20 packs of popular pH buffer solutions, 10 packs pH4.01 and 10 packs pH6.86 ❥Simple to use. Just add 250ml per powder packet ❥Powder has an indefinite shelf life ❥Easy 3-step procedure is written at the back of the packet ❥Package include: 10 x pH4.01 Calibration Powder,10 x pH6.86 Calibration Powder