Once you have timed an event, you turn the second crown at 10 o'clock, which moves the internal caliper bezel. The crown is rotated until the red tip of the second-hand lines up with the red 0 on the caliper scale. What you're looking for then is a match between the markings on the dial and the markings on the caliper scale the match is at "8″ on the scale, indicating 8/10ths second.
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