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* The 10 Books per pack (Each book contain 20 Papers). High accuracy pH test paper, pH range from 1-14* The 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* Eco Friendly* Easy to use