Chronograph mechanism

A chronograph mechanism comprising:

• a control device;
• a chronograph gear train configured to be driven directly or indirectly by a barrel and regulated by a regulator unit, the chronograph gear train comprising a second-counter mobile and a mobile with a first precision corresponding to a first fraction of a second, and the regulator unit oscillating at a frequency corresponding to the first precision;
• and
• at least one indicator which displays the seconds and first fractions of a second of the duration measured,
• wherein the chronograph gear train also comprises an additional mobile with a second precision corresponding to a second fraction of a second, which is driven and regulated by the mobile for the first fraction of a second via a mobile compensating the backlash, and
• wherein the chronograph mechanism further comprises an indicator for the second fractions of a second of the duration measured, the second fractions of a second being smaller than the first fractions of a second, the indicator for the second fractions of a second being actuated by said additional mobile.