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RCSP High accuracy pH test paper range from 1-14 pH 2-10.5 color chart with each book. The test strip color changes must be matched with the pH scale color chart within about 15 seconds. Can be used to measure pH of water, soap, lemon juice, vinegar, milk, liquid detergent, moisturized soil, urine, sweat. 10 Books per pack (Each book contain 20 Papers. pH 1-14 universal indicator papers take universal alkaline / acid tests with this pack of 80 litmus paper strips with a pH color chart on each pack test range.