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Depends on your set up. I have a gap between the magnet and sensor of about 6mm and it works consistently.
Something like these.
http://www.ebay.co.uk/itm/5pcs-12mm-x-5mm-N50-Grade-Strong-Small-Disc-Round-Rare-Earth-Neodymium-Magnets-/371021203241?pt=LH_DefaultDomain_3&hash=item5662964729
freezing77
Edit: did some research for magnets.