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Nicolette presents a set of 100 ph=paper strips. High accuracy pH test paper, pH range from 1-14 100 percent Brand New. Authentic Quality, pH 1-14 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, saliva, urine, sweat...etc. 10 Books per pack (Each book contain 20 Papers).