Features: Universal indicator papers used in scientific experiments and other fields to test the pH of substances. The indicator paper set is supplied with PH readings in the range of 3.8-5.4 For better testing effect, please do not expose the set of paper to air or sunlight PH range 3.8-5.4, 80 bars per pack with a clear colored PH scale for comparison application results: flower growing, fish keeping, toiletries and food industry, etc. Usage: immerse the travel in the solution to be tested for half a second, take out and contrast with the color chart to get PH readings Note: for better testing effect, please do not expose the paper set to air or sunlight the paper should be stored in a dark, dry place, no moisture can not indicate acid or alkaline solution, when its density was lower than 0.01%. Specifications: PH Range: 3.8-5.4 Test Paper Size: Approx. 63x40x3mm (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 Arrangement