The Rolex Milgauss 116400GV Z-Blue is an antimagnetic watch designed for scientists and engineers, capable of withstanding magnetic fields up to 1,000 gauss. It features a 40mm Oystersteel case, a distinctive green sapphire crystal (Glace Verte), and an electric Z-Blue dial, which is coated with zirconium and presents a sunburst metallic finish. The watch is also characterized by its orange lightning bolt-shaped seconds hand, a callback to the original 1950s models, and an Oyster bracelet. It is powered by the automatic movement Caliber 3131 and has a water resistance of 100 meters. The Z-Blue version was introduced in 2014.