Aside from the PH test, none of the others seem to be checking anything. We developed different solutions with different chemicals to see how they would change the test results - absolutely no difference. Complete scam. Pond water, well water, tap water, iron-saturated water, copper-saturated water, vinegar, etc. Only PH showed a different color. If you want to be comfortable with tap water, use them - they show you that everything is fine. Otherwise, if you want to know what's really going on, don't waste your money on it.
Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
7 Review
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
Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 Review
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
8 Review