Feature: 1. Accurate, efficient, no reference color, no halo, with high use value. 2. Dip a glass stick or dropper in a small amount of reagent and smear it on the paper. Then observe the change of color and compare the color of the paper. 3. Reusable, just pack and store in a dry place after using is ok. 4. Provides reliable and accurate pH readings. 5. Appropriate for testing alkaline or acid level of any liquid. Specification: Condition: 100% Brand New Item Type: PH Level Testing Paper Material: Test Paper Color: As Pictures Shown Measuring Range: PH1-14 Storage: Dry storage is recommended Package List: 1 Box PH Level Testing Paper Note: 1. Do not put the test paper directly into the solution 2. The test paper cannot measure the PH of concentrated sulfuric acid 3. More accurate measurement results in normal temperature environment