Litmus paper is probably the most familiar pH paper.
It is used to broadly test whether a solution is acidic or basic and comes in 3 types—red, blue, and neutral.
Condition: 100% Brand New and High Quality
Take accurate alkaline/acid tests with this Litmus paper strips
Each book also includes a color chart
The scale reads from 1 to 14:
1 – 3 indicates a very acidic substance
4 – 6 indicates an acidic substance
7 indicates neutral
8 – 11 indicates alkalinity
12 – 14 indicates a very high level of alkalinity
*1 Book pH Indicator Test Strips book