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Ph Sensor. pH Sensor (For LabQuest, LabPro, Go! Link, EasyLink, CBL 2, and CBL) is a Ag-AgCl combination electrode with a range of 0to 14 pH units. This high quality electrode has many uses in chemistry, biology, and middle school classes, as well as water quality monitoring. Included is a convenient soaking bottle with storage solution. pH Buffer Capsules and pH Storage Solution are also available. Ph Sensor