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The Bluelab ONE Pen measures pH, EC or ppm, and temperature through a single probe, so one instrument and one dip covers readings normally taken with two pens.
Readings sync over Bluetooth to the Edenic app, so they can be logged and reviewed rather than written down at the reservoir. The probe is looked after as any pH probe is: calibrate with Bluelab solutions and keep it in KCl storage solution between readings.
A good fit for growers with one or a few reservoirs who want a single pen for daily checks and a record of them.
