Milwaukee pH Starter Solution Sachet Kit is set of pH calibration and electrode rinse solutions designed to optimize the accuracy of your measurements and avoid cross contamination between samples or calibration solutions. Included in the kit is lab grade pH 4.01 buffer solution (M10004B) sachets, pH 7.01 buffer solution (M10007B) sachets, pH 10.01 buffer solution (M10010B) sachets and electrode rinse solution (M10000B) sachets. All sachets are 20 ml. The buffer solutions are certified to meet the standard to an accuracy of +/- 0.01 pH removing the inaccuracies involved with mixing buffers. Electrode rinse solution is ideal for using as an intermediate rinse between samples or calibration solutions to avoid cross contamination. This rinse solution is also ideal for removing basic salt deposit buildup on the probe or cap caused by storage solution evaporation. Even though salt deposit buildup is normal, it should be removed before measurement or calibration. Electrode rinse solution sho