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1.       Tear one strip, and dip into the liquid. Compare with the standard color after half      second,   obtain PH.

2.        The paper does not apply to a very weak buffer solution and concentration less than 0.01% of the acid-base solution

3.       The paper should be stored in a dark dry place, not damp

Ph range is : 0.5-5.0    3.8-5.4      5.4-7.0      5.5-9.0       6.4-8.0        8.2-10.0