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These pH strips are easy to use and a color reference chart is printed on each bag. Use wide range pH 1-14 acid-base test strips when you have a diverse range of materials and/or aren't sure what to expect. 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. With practice and using the same light source every time, you may be able to infer pH changes of less than 1 pH unit.
Specifications:
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