Use this paper to dip into the solution or substance to be measured, then compare it to the color chart.
Example for soil to be measured
Neutral soil has pH= 7;
pH < 5 is acidic soil (acid soil);
6 < pH < 7 is best for many plants.
old up paper to measure pH range from 1-14.
Other names: litmus paper, purple litmus paper
Box has 20 stacks
pH measuring paper 1-14, in stack form
In the experiment, high precision is not needed. We use pH paper (purple litmus paper) to measure. The paper color will change when in contact with the soil or solution to be measured.
1x PH 1~14 Paper Litmus (80pcs Pack) Paper Tester Acid Alkaline Sains Kertas Litmus Kertas pH Asid Alkali STEM Science