Tag heuer watch grand carrera automatic chronograph the grand carrera calibre 36 rs caliper automatic chronograph is the worlds first mechanical chronograph which measures and displays time to 110th of a second the unequalled caliper rotating scale magnifies the 110th second scale for at a glance readingsthe cosc certified movement oscillates at an astonishing 36 000 vibrations per hour this enables the central seconds hand to count 110th of a second intervals inspired by gt race ca