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VANTAKOOL Digital PH Meter, PH Meter - 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium CT-6021A Pen pH Meter Instruction Manual Pen type digital pH meter, all in one, pH electrode is Auto calibration for pH 4.0, pH 6.8 and pH 9.1. Ph Meter User Manual; Vantakool Digital Ph Meter Manual. Product Description. ? wide use: Pocket Size PH Meter is the ideal test kit for home and The readings fluctuate all over the place. I can calibrate it using the manufacturer's instructions only to find that when I immediately place it back in the The meter uses 357A batteries. 4. Close the battery compartment. Make sure it is tightly closed. Temperature Calibration. If you need to calibrate theVantacool Digital PH Meter, PH Tester with ATC,Water Quality Tester 0.01pH High Accuracy, 0.00-14.00 Measurement Range, 0.01 Resolution Measure Household vk.cc/c6VbFl. VANTAKOOL DIGITAL PH METER USER MANUAL >> READ ONLINE bit.do/fSdKM. (Note: This ph meter is factory calibrated. Users can use it directly.)