Tachymeter scale on bezel. The tachymeter indicates the average speed of a car, for example, by measuring the time taken to cover a given distance (a kilometer or a mile). Three counters for running seconds, chrono minutes and hours. TAG Heuer Automatic chronographs make it possible to measure times of up to 12 hours with an accuracy of 1/8th of a second. They are all fitted with very high-frequency Swiss movements and represent one of the great achievements in the long watchmaking tradition and history of the company. The principal characteristics of TAG Heuer automatic chronographs are reliability, simplicity of use and a highly legible display. They have a number of useful functions for professional and leisure sporting activities, as well as for everyday use: Simple time measurement & additional time measurement. Central chrono seconds. Date window at 3 o'clock. Water resistant to 100 meters. Ensured by rigorous manufacturing standards and strict testing. Scratch resistant sapphire crystal for excellent durability. All our 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. Crown stamped with the TAG Heuer logo. Polished steel case. Hand-applied indexes and numerals 3,6, 9 and 12. Monochrome TAG Heuer logo. Polished hands with luminescent markers. Screw-in casebook with specific fang decoration. 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.