Litmus Paper NEW pH 1 to 14 Test Book 80 Strips for Soil Water Liquid

Saliva, urine & sweat. 📊 pH Scale Guide. pH 1–3: Very acidic. pH 4–6: Acidic. pH 7: Neutral. pH 8–11: Alkaline. pH 12–14: Strongly alkaline. pH Range: 1–14.

eBay