It is a common strategy for scrap yards to use magnets for advertising. To find out if your scrap yard provides magnets, check the employees. If they all have the same type of magnet (different colors maybe) the yard probably buys them in bulk and will give them to their regular customers. If you get a different type of magnet than the employees have then the yard has high quality magnets for business and low quality for advertising. Not all magnets are created the same.
A couple of ways to test the quality of your magnet include hanging it close to slightly ferrous stainless steel to see if it swings towards it or check how far from ferrous it creates the magnetic field. I have seen some that have to touch the steel to stick and others that will attach from half an inch. It is nice to become one with your magnet.
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