
I was looking for an inexpensive way to check the acidity of a liquid. I ran tests on some known substances and the results were exactly what I expected and easy to read with no need for color chart comparisons.

Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
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Accurate And Versatile Digital PH Meters For Food, Brewing, Hydroponics, Pools And More!
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TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
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Digital PH Meter Tester - Tiaoyeer Water Quality Tester With ATC, 0.01PH High Accuracy, 0.00-14.00 Measurement Range, 0.01 Resolution For Drinking Water, Aquarium, Swimming Pools, Hydroponic
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