2 Pairs of pH Buffer Solution Powder for Meter Calibration Light and Portable Just Add Distilled Water Makes 2 x 1 cup Jars of Each 401 and 686 Solution ** You can find more details by visiting the image link.
pH and Buffers: In this video Paul Andersen explains how buffer solutions maintain pH in a solution. A buffer solution is made up of a weak acid and its conjugate base. As strong acids or bases are added the pH remains stable. A good buffer solution has a pKa value equivalent to the pH and equal amounts of the weak acid and the conjugate base.