
Meter was calibrated two weeks ago and showed correct pH within a few days. THIS MORNING IT SHOWED A PH OF 13. I TESTED THE PH MANUALLY TWICE AND IT WAS 5.6 TO 6. I DON'T UNDERSTAND WHAT HAPPENED BUT I CAN'T BE SURE THAT THE READING IS. WILL NOT USE ANY MORE.

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

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

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