Standard Magnet Tester These are the strongest magnets available to the public. These Magnets have a very strong pulling power. Magnets are used for preliminary testing of jewelry items. Testing with one of these magnets can be done by hanging it on a string to attract the item being tested towards it. Another way to test is to place item being tested at a 25 degree angle, and place a magnet smaller than item on top end and allow to slide, if it slides slow than item may contain for example 15% metal, if it slides fast, then no metal is present. WARNING: KEEP OUT OF REACH OF CHILDREN. THIS IS NOT A TOY. DO NOT INGEST OR INHALE. SEEK IMMEDIATE MEDICAL ATTENTION IF MAGNET(S) ARE SWALLOWED OR INHALED. MAGNETS ARE BRITTLE. BROKEN MAGNETS ARE SHARP. MAGNETIC MEDIA AND ELECTRONIC EQUIPMENT HAZARD. KEEP AWAY FROM PACEMAKERS AND INTERNAL MEDICAL DEVICES. Thank You For Looking !!! Buy with confidence from a trusted seller