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pH Calibration and Maintenance Set with pH 4 7 10 Buffers and Potassium Chloride Subcategory_Volumetric Flasks housed in a vinyl covered zinc housed in a vinyl covered zinc steel case with a fold out winding handle for field work and troubleshooting exercises and 10 with potassium chloride maintenance solution for pH meter calibration and electrode care pH calibration set pairs buffers at pH 4
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