I think microseconds are too accurate. This is a manually operated stopwatch. For example, in athletics hand held times are returned to 1/10 second because of human error. E.g. http://www.seaoa.co.uk/duties/timekeeper/102-timekeeping-primary-duties.html
Out of convention, we can stick to 1/100 seconds, because that's what wristwatches provide and people are used to it.
I think microseconds are too accurate. This is a manually operated stopwatch. For example, in athletics hand held times are returned to 1/10 second because of human error. E.g. http:// www.seaoa. co.uk/duties/ timekeeper/ 102-timekeeping -primary- duties. html
Out of convention, we can stick to 1/100 seconds, because that's what wristwatches provide and people are used to it.