Inaccurate
At first, it seems really good. i used it to label my magnet, then when i went to double check, it gave the opposite end instead. i then realized that if u gently turn the magnet over close to the sensor, it wont identify the polarity change and will instead keep what it originally showed. for example, u put the "south" end close to the sensor, then gently turn it over so that the "north" end is close to the center, it will still read it as the south end.
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