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This pH tester kit allows you to accurately test the pH of various substances including foodstuff, Aquarium/Water, Urine, Soil, etc. Has a distinct color match at each full pH unit Accurate, reproducible readings with an immediate response Simply press the testing strip to the object or liquid you are testing. Half second later, take out the paper and using the color chart included, compare the color change of the paper to find out the acidity level of your testing subject. Can not indicate the Acid or alkali solution when its density was lower than 0.01%. Different pH content discoloration range is different, by comparing the color card ratio: the smaller the number, the stronger the acidity, the larger the value, the stronger the alkalinity. PH test paper can be commonly used to test many commonly used substances, including urine, sweat, moisturizing soap, lemon juice, milk, liquid detergent, moist soil, and so on. Litmus Paper test strips change color within 15 seconds to be matched with the pH scale color chart. Scales are as follows:- 1-3 Indicates a very high Acidic Substance. 4-6 Indicates an Acidic Substance. 7 Indicates Neutral. 8-11 Indicates an Alkaline Substance. 12-14 Indicates a very high level of Alkalinity.