I love that these pH strips come with a color chart to compare and it's large enough for me to read. The actual pH strips come in a container. You simply remove a strip, put it in your sample, wait for the color to change and then compare. The pH seems to measure very accurately as I've compared with other tests and get the same results. Results are also within ranges I've found online for certain products, so that tells me that these test strips are pretty accurate. There is a wide range of colors so it makes it easy to find where the strip falls on the chart. Product provided for evaluation.
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