
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

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

80 Pieces Water Test Litmus Strips Litmus ph Paper Soil Acidity Meter Liquid pH Tester 1-14
10 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