Omega Seamaster Aqua Terra This Omega watch rivals and surpasses the Rolex Milgauss for magnetic resistance. The Aqua Terra can withstand up to 15,000 gauss, whereas the Rolex can withstand a total of 1,000 gauss. The problem of magnetism has plagued watchmakers for quite some time. This watch is designed for usage near power plants and labs like CERN in Geneva (the Large Hadron Collider).