Six large studs on bezel allow for easy manipulation with diving gloves. Double security clasp bracelet with easy to use push buttons. Luminescent hands and indexes are hand-applied and provide excellent visibility in the dark or underwater. Water resistant to 300 meters: apron of ultimate resistance; ensured by rigorous manufacturing standards and strict testing. "Grande Date" display below 12 o'clock. Chronograph accurate to 1/10th of a second. In 1975, TAG Heuer introduced the world's first quartz chronograph. Today, the company is still at the cutting edge of timing technology and produces quartz chronographs that offer highly accurate time measurement, while remaining easy to use. The 1/10th sec. quartz chronographs can measure up to 12 hours of elapsed time to within 1/10th of a second. They have the following basic functions: simple time measurement and additional time measurement. Scratch resistant sapphire crystal for excellent durability. All TAG Heuer watches are fitted with sapphire crystal. This is cut from a polished slice of solid sapphire that has been created by the fusion and crystallization of alumina. Sapphire is so hard that only a diamond can scratch it. Anti reflective treatment for easy readability. Oversize screw in crown with double gaskets makes for easy-to-hold and ensures water resistance to 300 meters. Unidirectional turning bezel measures time limits and is an essential safety feature. Any accidental movement of the bezel can only reduce the indicated remaining time. The high level of TAG Heuer quality is founded on the rigorous choice and continuous monitoring of all its suppliers and their products. Throughout the manufacturing process, each component is subjected to numerous tests and controls designed to verify how carefully it has been made.