Features: Universal indicator papers used in science experiments and other fields to test the PH of a substance. The indicator paper set comes complete with PH readings in the range of 5.5-9.0 For a better testing effect, please do not expose the paper set to air or sunlight PH range 5.5-9.0, 80 strips per pack With distinct color PH scale for result comparisons Applications: Flower growing, fish keeping, toiletries and food industry, etc Way to Use: Dip the trip into the solution to be tested for half a second Take out and contrast with the color chart to get PH readings Note: For a better testing effect, please do not expose the paper set to air or sunlight The paper should be stored in a dark dry place, not damp Can not indicate the Acid or alkali solution when its density was lower than 0.01%. Specifications: PH range: 5.5-9.0 Test Paper Size: Approx. 63 x 40x3mm(LxWxH) Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 80 x PH Test Papers 1 x Color Chip