litmus paper

Lithmus papers are the simplest and easiest way to measure pH values where no precise pH value is required. They are useful for determining whether a solution is acidic or basic.
The red lithmus paper has a pH measurement range 5,0 pH to 8,0 pH. The color changes from red to blue.
The blue lithmus paper has a pH measurement range 8,0 pH to 5,0 pH. The color changes from blue to red.
Packed as a booklet of 20 papers. 10 booklets are packed in a polystyrene box for for easy dispensing.