The CHRONOMASTER Sport combines elements of past ZENITH chronograph references such as the tri-colour dial, pump-style pushers and steel bracelet with a black ceramic bezel, all in a modern 41mm case. This version features a white dial paired with a blue rubber strap. Powered by the El Primero 3600 1/10th of a second automatic chronograph movement. THE NEW ERA OF EL PRIMERO The CHRONOMASTER Sport is the culmination of over 50 years in mastering the automatic chronograph. Equipped with the latest generation of the El Primero chronograph calibre, it measures and displays elapsed time with a precision of 1/10th of a second. EL PRIMERO 3600 MOVEMENT The result of over 50 years in mastering the automatic high-frequency chronograph movement. The latest version of the El Primero calibre, dubbed the El Primero 3600, operates at the high frequency of 5Hz, with the ability to offer a true 1/10th of second indication. Its autonomy has also been efficiently extended to a power reserve of 60 hours.