Comparator Paper pH 4.0 - 8.0, 5M Reel
Comparator Paper PH 4.0 - 8.0, 5M Reel, 5M Reel
Johnson Test Papers Comparator Paper pH 4.0 - 8.0, 5M Reel
Remove some of the paper from the reel. Dip the paper into the solution you are testing for around 1-2 seconds and remove. You then compare the colour of the paper against the reel's colour chart to give you a pH reading.