
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.

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

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

π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review

Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review

π§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review

π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review