If your watch has a tachymeter, you can easily determine speed and output per unit of time by reading the tachymeter numbers.
Some models have a scale notation intended to measure more than 1 minute.
How to measure kilometers / hour
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Measure the time (within 1 minute) it takes to run 1 km.
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Check the numerals on the tachymeter scale to which the stopwatch seconds hand is pointing.
Ex.:
If it takes 45 seconds to run 1 km...80 km/h
How to measure the hourly rate of operation
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Measure the time (within 1 minute) required to complete 1 job.
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Check the numerals on the tachymeter scale to which the stopwatch seconds hand is pointing.
Ex.:
If it takes 20 seconds to complete one product...180 products/hour
