These pH strips are ideal for testing strong acids with high pKa such as battery acid, HCl (hydrochloric-muriatic acid), sulphuric acid or even lemon juice right up to very weak acids and ph neutral 7.0.
They are easy to use and a color reference chart is printed on each bag.
These pH test strips feature triple pads on each measuring stick. This is to ensure the best contrast & color comparison under different lighting conditions. Depending on the pH you are measuring any two of the pads will change while the 3rd doesn't.
After dipping the strip, compare the 3 colors to find the closest match.