
These strips do not work properly, see pictures: Three strips (from top to bottom) contain 5% vinegar, tap water and baking soda. Understandably, water looks acidic and baking soda looks like water. Possibly a bad batch. Despite this, the quality control is very poor. Dangerous to use.

Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
7 Review

Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
18 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