Whether you’re polishing your magnetic death ray or powering up your Stargate, the effects of magnetic fields on your watch can be quite destructive. Back in the old days when scientists wore suits and nice watches to work, they would bring their timepieces too near certain pieces of equipment, rendering the movement useless. Rolex solved this by wrapping its movements in non-ferrous metal but their watch, the Milgauss, could only handle up to 1,000 Gauss.