M10004B is a lab grade pH 4.01 buffer solution certified to meet the
standard to an accuracy of ±0.01 pH removing the inaccuracies involved
with mixing calibration solutions from powder. Sachet packaging means
that you get fresh solution every time. Ideal for infrequent or field
use. No risk of using expired calibration solution. Milwaukee solutions
are designed to help you achieve reliable and repeatable pH measurements
while extending the life of your electrode.