stopwatch

Suiting action to word, he took up his stopwatch and set the needle swinging.

I don't think I can answer that question accurately, because the time approximation, without a stopwatch, would be difficult.

Do you remember offhand what the stopwatch timed us at—I think we did it twice, is that correct?

Did we make any or do any stopwatch tests about any route from the southeast corner of the sixth floor down to the lunchroom?