Seiko 6M25 Instruction Manual page 19

To measure the hourly rate of operation
Use the stopwatch to measure
1
the time required to complete 1
job.
Tachymeter scale indicated by
2
Second hand gives the average
number of jobs accomplished per
hour.
Ex. 2: If 15 jobs are completed in 20 seconds:
"180" (tachymeter scale figure) x 15 jobs = 2700 jobs/hour
Ex. 1 Ex. 1
"180" (tachymeter scale figure) x 1 job
= 180 jobs/hour
Second hand:
20 seconds
Tachymeter scale:
"180"
19