Simple Operation---Remove a small test bar, touch the liquid under test, and compare the test results to a standard color on the map after a few seconds. PH Measuring Range---The PH level testing paper has a complete PH range, measuring PH from 0 to 14. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, the PH level testing paper is easy to read. How to use---Test specimens are prepared separately, directly immerse the color block into the liquid; take it out for 2 seconds, shake off the excess water, then compare the value on the color card pH 7 is alkaline, the greater than 7 the stronger the alkaline, the less than 7 the stronger the acidic Convenient to Use---The PH testing paper has reel design, light and compact design, easy to use and wear. High Accuracy and Wide Application---Good quality, fast and accurate results in a few seconds. As long as it is aqueous solution can be measured.