Buffer Set - pH 4 - pH 7 - pH 10, Concentration 100 Percent (weight), CAS Number 7732-18-5, Chemical Grade Lab, Chemical Family Type Buffer, Solution, Shelf Life 18 mo, Standards Not Applicable, Special Information pH Electrode Before and After Taking Measurements to Prevent Contamination Convenient, pre-measured pH calibration solutions for your meter. Rinsing solution used for cleaning off the pH electrode before and after taking measurements to prevent contamination. 20 units/pieces included along with the item.
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