Calibration

Do I have to follow the calibration setup on the app with a brand new unit, one video says they’re already calibrated.

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Maybe this will help

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I would as I had to calibrate one of them and mine was brand new too. Also FWIW, my ph probe needed recalibrating after only 3 months in my one grow.

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Same here! Mine were new and had to calibrate them as well.

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