Due to the different monitors, the color may be slightly error. Please contact us if you have any questions. Attention:The test paper can not be directly dipped into the solution.The test paper can not touch the test tube mouth, bottle mouth, catheter mouth and so on. When you are measuring the pH of the solution, the test paper can not be previously wetted with distilled water, because the wetting test paper is equivalent to diluting the test solution, which can lead to inaccurate measurement. The correct way is to dip in the middle of the test paper by glass rod with solution to be tested. After the test papers' discoloration, then you can compared it with the standard color card to determine the pH of the solution. After taking out the test paper, the lid of the container which contains the test paper should be tightened to avoid contamination by some gas in the laboratory.
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