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DuvinDD 15 Pack pH Meter Buffer Solution Powder for Precise pH of PH Meter, pH Calibration Solution Powder 4.00/6.86/9.18: Amazon.com: Industrial & Scientific
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Buffer Solution, pH 4, Coloured (Red), 500ml [MER-1.09475.0500] : Aim Scientific - A leading provider of laboratory and chemical supplies to the Scientific, Clinical and Educational laboratories, Adelaide
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Ph meter | Sigma-Aldrich
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Buffer solution (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 9.00 (20°C) Certipur® | Sigma-Aldrich
