The Rolex Milgauss is a line of watches produced by the Swiss luxury watch brand Rolex. The name "Milgauss" is a combination of the words "mille", which means "thousand" in French, and "gauss", which is the unit of measurement for magnetic fields. The Milgauss was originally developed in the 1950s for scientists and engineers who needed a watch that could withstand high levels of magnetic fields in their work environments.

The Milgauss features a distinctive orange lightning bolt-shaped seconds hand and a case that is made of stainless steel or white gold. Its movement is protected by a soft iron cage that shields it from magnetic fields, allowing it to maintain its accuracy even in environments with strong magnetic fields up to 1000 gauss. The watch is also equipped with a Parachrom hairspring, which is a special alloy that is more resistant to shocks and temperature changes than traditional hairsprings.

The Milgauss is a relatively rare watch and it's considered a niche product within Rolex's lineup, it's considered a "tool watch" and is less well-known than Rolex's more popular models such as the Submariner, the GMT-Master, or the Daytona. Nevertheless, the Milgauss is a highly sought-after watch among collectors and enthusiasts, who appreciate its unique design and technical capabilities.