Make sure your water is safe before using : Litmus paper is invaluable for testing the acid and alkaline levels in all kinds of applications from spas, ponds and aquariums to conducting scientific experiments.
Product Description
* 1 - 3 indicates a very acidic substance
* 4 - 6 indicates an acidic substance
* 7 indicates neutral
* 8 - 14 indicates alkalinity
* 12 - 14 indicates a very high level of alkalinity