The photo shows both blue litmus paper and red litmus paper, but there is no way to choose which one you want. Have blue litmus paper. The only thing it does is turn it orange/red when something is acidic. She does not provide more precise information on the pH value. I wanted to use it to test the pH of drinking water, but it's useless for that.
π― Honey Refractometer with Automatic Temperature Compensation (ATC) - Tiaoyeer Moisture, Brix, and Baume Refractometer for Honey, 58-90% Brix Scale Range - Honey Moisture Tester
31 Review
Accurate And Versatile Digital PH Meters For Food, Brewing, Hydroponics, Pools And More!
7 Review
Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 Review
TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review