
Using this product in my classroom I can say that this litmus test does what it is supposed to. Blue paper reliably turns red under acidic conditions, and red paper turns blue under basic conditions. They are not intended to provide an exact pH value, but are for general guidance only. I wasted no time evaluating the sensitivity of litmus paper. If you're trying to test something very slightly acidic and alkaline, this might not be the best option.

TDS water quality tester - TDS water hardness meter (portable digital salt meter for water analysis)
9 Review

π PH 1-14 Extensive Storage Testing Monitoring: Optimize Your Storage with Precise pH Level Monitoring
6 Review

Accurate And Versatile Digital PH Meters For Food, Brewing, Hydroponics, Pools And More!
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