These EM Science ColorpHast strips are designed for easy colorimetric
indication of pH
These EM Science
Colorphast strips are designed for easy colorimetric indication of pH. The
strips can be immersed in the sample for a long period of time, so weakly
buffered solutions can be tested with accuracy. Just dip the strip in your
solution and match the exact color of the pH on the strip to that of the
box-it's that easy. There is no bleeding of dye, even in strongly alkaline
solutions.