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I studied the website and there is no calibration procedure involved in the use of the VG400 moisture sensor.
I'd call it calibrated if the output voltage complies with the moisture level of the soil, e.g. 3V output voltage at full wetness.
Boncuk
BTW, resistive soil moisture sensors are much cheaper and have little corrosion if made properly. I'll build a prototype and after testing I'll publish the results at the forum.
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