The Ratio FreeDiver Helium-Safe 1000M Sapphire Automatic Diver Watches are an innovative diver’s watch, meant for divers and adventurers globally and also for daily wearing. The model features a professional-grade, corrosion/erosion proof and shock-resistant, airtight case around one of the most revered name among shock movements. The perforated band makes trapped moisture evaporate faster. Its timeless design is based upon the set dive watch standards and norms. User-friendly luminous dots and hour-markers upon make the watch very lively your distinctive. Facts before figures Ratio FreeDiver Helium-Safe 1000M Sapphire Automatic Diver Watches Crafted from surgical-grade stainless steel has a fully-functional, Helium-release valve suitable for saturation/deep-sea diving. The sapphire crystal is slightly domed, magnifying the dial underneath.What complies? An appealing appearance for anyone with a passion for dive watches.Retro/modern design meets extraordinary technique.Descends to depths even greater than the world record for free diving!Guaranteed on its accuracy and reliability! The Caliber NH36 is crafted and assembled by expert and experienced watchmakers in-house facilities. It has the usual configuration of a balance wheel and a hairspring besides the mainspring; it’s the ETACHRON regulator that ensures its accurate timekeeping, enhancing its reliability.The base is a curved metal slab; engraved and offering a stronger grip and heightened protection. Figures define the watchPressure tested for 1000 meters underwater.316L steel is inert towards any kind of corrosion, including rust.Measures 47mm across and 15mm thick; excellent visibility under low light.Japanese Caliber NH36 is a workhorse movement, built to withstand high-intensity impacts and concussive shocks and provide accurate timing.