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Solution to calibrate pH meters Digital and Analogue solution to calibrate pH meters. Two envelopes.Accuracy +/0.01 pH. Features & # x2022; 1 on pH 4.00/4.01 25ºC and another on 6.86 25ºC & # x2022; diluted with 250 ml of distilled water & # x2022; Accuracy +/0.01
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