If you are working with magnets and you need to figure out the polarity or even "see" the magnetic field around it, you should really build this simple magnetic probe. It is made out of NE555 timer configured as VCO, piezzo buzzer, hall effect sensor and a few passive components.
NE555 produces a constant distinctive sound when hall effect sensor doesn't sense any magnetic field. As soon as the sensor picks up magnetic field, it will result in voltage change on it's output pin that is further connected to NE555's input pin which will finally result in change of sound pitch on the buzzer. The pitch differes when sensor is closer to south pole than the north, so you can easily figure out it's polarity as shown in the video.
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