Omega has unveiled the production version of the Seamaster Aqua Terra > 15,000 gauss, which has the highest level of magnetism resistance of any wristwatch today.

Resistant to magnetic fields of over 15,000 gauss (or 1,000,000 A/m or 1.5 Tesla), the Omega Seamaster Aqua Terra > 15’000 gauss is a big technological achievement. It far exceeds the magnetism resistance of other watches, thanks to the use of proprietary non-magnetic alloys for key movement components. This means the movement itself is resistant to magnetism, in contrast to the traditional method of dealing with magnetism, which shields a regular movement via soft iron enclosure. A soft iron  cage usually protects against a magnetic field of up to 1000 gauss or 80,000 A/m, but at higher levels of magnetism the soft iron protection is ineffective. 

Movement protected from magnetic fields by soft iron cage which works up to 1000 gauss or 80,000 A/m

Soft iron cage is ineffective at magnetic fields of 1000 gauss and above

In the Omega  Seamaster Aqua Terra > 15’000 gauss the magnetic fields pass through movement, but it is entirely unaffected

Take for instance some competitors which use soft iron cages to protect the movements inside: the Panerai Submersible Amagnetic is rated to 40,000 A/m, while the antimagnetic Grand Seiko automatics are 80,000 A/m, and so are the Rolex Milgauss and IWC Ingenieur.  Developed by Omega, ETA, ASULAB (the R&D division of the Swatch Group) and Nivarox FAR (the component manufacturer best known for its hairsprings), theCo-Axial 8508 inside also has a silicon balance spring, as well as the four year warranty that comes with all Omega watches equipped with silicon parts. Because the COSC certified chronometer movement needs no shielding, it is visible from the display back, which is of course a first for an antimagnetic watch. The Seamaster Aqua Terra > 15’000 gauss has a black dial with yellow accents, along with a 41.5 mm steel case, which is water resistant to 150 m. It is available on leather strap or steel bracelet. – SJX