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10
TACHYMETER
[for models with tachymeter scale on the dial]
Tachymeter scale can be used only when the time required is less than 60 seconds.
Ex. 2: If the measuring distance is extended to 2 km or miles or shortened to 0.5 km
or miles and STOPWATCH second hand indicates “90” on tachymeter scale:
To measure the hourly average speed of a vehicle
Ex. 1
STOPWATCH
second
hand:
40 seconds
Tachymeter
scale: “90”
“90” (tachymeter scale figure) x
1 (km or mile) = 90 km/h or mph
1 Use the stopwatch to determine
how many seconds it takes to
go 1 km or 1 mile.
2 Tachymeter scale indicated by
STOPWATCH second hand
gives the average speed per
hour.
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