Calibrating The pH Meter

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Cheap pens drift within a few weeks and start reading half a point out, which sends people chasing deficiencies that do not exist. Calibration solution costs very little and takes two minutes to use. Troubleshooting pages covering lockout symptoms and their causes are posted at https://queenfeminizedseeds.com in the problem solving section. Replacing the probe every year or so is normal rather than a sign of a bad meter.