Magnet magnet 10 10*3 diameter thickness 3 Hall sensors special round magnet round magnet<br><img src="//gdetail.image-gmkt.com/030/717423496/2016/4/be338e20-f252-4fd0-b988-aa171f693e39.jpg"  onerror="this.src='http://gdetail.image-gmkt.com/030/717423496/