Accurist 6W50 Operating Instructions Manual page 38

Chronograph measurement:
1. Press BR Button to enable the chronograph mode.
The second hand located in the 1/20th dial rapidly advances to the 0 position.
2. Press TR Button to start and stop chronograph.
A confirmation tone is heard whenever the TR Button is pressed. After 30 seconds the
Second hand on the 1/20th dial will stop at the zero position. However, the time will
continue to be measured in 1/20ths second and when TR Button is pressed to stop
the timing, the 1/20th Second hand will automatically move to show the 1/20th
time.
3. Press BR Button to reset all chronograph hands to the 0 position.