I know how how pH test mare's based on the 0-14 pH scale, but my mom brought home these pH test strips that are from 0-500 PPM (parts per million)
Any clue how to use these? I've tried to find calculators online to no avail and have only found a whole bunch of formulas that require way too much math than I know.
Any clue how to use these? I've tried to find calculators online to no avail and have only found a whole bunch of formulas that require way too much math than I know.
