TUDOR 42000CN, Manual

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The bezel on your watch has a tachymeter function
used to measure a speed or a flow rate using
the chronograph function. Select the desired unit
of measurement (metre, kilometre, mile, litre, etc.],
activate the chronograph and stop it when the desired
unit is reached. The centre seconds hand indicates
the number of units per hour on the tachymeter scale.
In order to ensure the precision of the tachymeter,
the unit of measurement must be exactly reached. In
addition, the time of measurement should not exceed
1 minute and should not be less than 9 seconds.