The pH 1-14 test strips (single pad) are wide-range strips measuring in steps of 1.0 pH units, and give results in just seconds. Use wide range pH 1-14 test strips (acid-base) when you have a diverse range of materials, and you are unsure what end of the spectrum you will land on. This strip has one pad for ease of reading and can be used in many different circumstances. For example, you can test the pH of drinking water, whether straight from the tap or bottled, which should be pH 5-7-6.2. Each bag contains 100 test strips.