pH testing strips for measuring the pH of your water and wort when making beer, range pH 5.2 - 6.8. Simply dip the strip completely in the solution for 3 seconds and compare the middle section with the colour scale. Getting the right level of pH (acid to alkali) in beer is important for many things including colour, head retention, hop aroma, hop bitterness, as well as releasing the sugars from the grain.