Yema SPACEGRAF ZERO-G, Руководство пользователя

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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.