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This is a double-junction replacement pH probe for Bluelab pens and meters, fitted when an existing probe has reached the end of its service life.
pH probes are consumables. Response slows and readings drift as the junction ages, and no amount of calibrating brings a worn probe back. Fitting a new probe restores accuracy without replacing the meter. Check the probe against your particular Bluelab model before ordering, then calibrate after fitting and store it in KCl storage solution.
For growers already running a Bluelab pH pen or meter that is no longer holding calibration.
