only suitable for basic acid and alkali tests subtle differences pffff forget it Paper is either normal color or the darkest highly alkaline color, nothing in between
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
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
Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
7 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review
Digital multimeter RGK DM-12
6 Review
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review