80 for each pack, can use 80 times.
Each package comes with separate color cards. After testing the color of the palette, you can see the pH.
This PH test strip is a wide range of tests for laboratory / cosmetic / drinking / saliva / urine / vaginal fluid testing and so on.
PH less than 7 is acidic, PH equals 7 is neutral, and PH is greater than 7 is alkaline.
The stronger the acidity, the smaller the pH value, the stronger the alkalinity, the greater the pH