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![HANNA] pH 측정기 HI 8424 사용 및 캘리브레이션 방법 - 한나 pH Meter instruction and calibration method - YouTube](https://i.ytimg.com/vi/PneU9RyDo3w/maxresdefault.jpg "HANNA] pH 측정기 HI 8424 사용 및 캘리브레이션 방법 - 한나 pH Meter instruction and calibration method - YouTube")