Features:It comes in a nice plastic box that is easy to carrySuitable for testing the alkaline or acid level of any liquidUniversal pH paper is also great for science education, a great product to have in any lab and at home to measure and control the quality of water, urine, saliva, soil, alkaline diet, aquariums and others PH wide range 0-14, 100 strips per pack with a clear colored PH scale for result comparisons Color change indicator paper must be matched to the pH scale color chart in about 15 seconds0 - 3 indicates a very acidic substance4 - 6 indicates an acidic substance7 indicates neutral8 - 11 indicates alkalinity12 - 14 indicates a very high level of alkalinityHow to use:Test the liquid ready, take out the test paper, 2 color blocks all immersed in the liquid, after 1 second to take out, unlike the color color reading values in 30 secondsNote: An acid or alkali solution cannot be indicated when its density was lower than 0.01%. Store dry for the rest of the paperPlastic box size: 6.7x8.7x1.1cm Quantity: 1 set/100 stripsNote: Please allow 1-3mm error due to manual measurement. Pls make sure you do not mind before you make a bid, due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Contents:1 Set x Litmus Paper1 x Plastic Box