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Box of 20 -- This is the easiest way to calibrate a pH pen or meter in the field. Each single pouch contains 20 mL of calibration solution. Rinse water singles contain 20 mL of deionized water for rinsing pH, ORP or dissolved oxygen probes. Each box contains 20 individual calibration pouches. BP5 is an assortment of all four liquids. Shelf life is one year.