What is the safe distance that I need to keep to my devices?
Various object have a sensitivity to static magnetic fields of permanent magnets. They disturb some devices only temporarily, but others could be damaged permanently.
Below you can find an (incomplete) list of objects that should not get too close to permanent magnets. For each object, we included the recommended safe distance to a variety of disc magnets.
High-quality magnetic card (credit card, ATM card)
Safe distance: 2 cm
Cheap magnetic card (parking garage, admission ticket)
Safe distance: 5 cm
Safe distance: 7 cm
Safe distance: 9 cm
Mechanical watch, non-magnetic pursuant to ISO 7646
Safe distance: 4 cm
Mechanical watch, not non-magnetic
Safe distance: 18 cm
Safe distance: 3 cm
USB stick, memory cards
Camera, cell, smart phone
No danger for data carrier
Unclear - keep at least 5 cm safe distance