400
300
240
200
170
140
150
120
110
100
90
80
85
75
70
65
60
STOPWATCH
SECOND HAND
WATER RESISTANCE
Note that the water resistance chart serves
only as a guide (please refer to the water
resistance chart on the next page). Actual
water resistance may vary depending on a
number of factors including water
temperature, water salinity, and use under
water.
The water resistance of your timepiece
may eventually be compromised over time
with general wear and tear and use of your
timepiece under adverse conditions.
Always remember to employ the screw
down crown if available to maintain the
water resistance of your timepiece.
Warranty may be voided if the screw down
crown has not been properly employed.
Note that you should never wear your
watch in a jacuzzi, hot shower or steam
room where steam may enter the case
despite the water tight seals used to
protect your watch. This may cause
condensation inside your watch which
may effect and damage the inner workings
of your watch.
30M/
3ATM
50M/
5ATM
100M/
10ATM
150M/
15ATM
200M/
20ATM
WATER RESISTANCE
CHART
SPLASH/
SHOWERING
SWIMMING/
BATHING
BRIEF SWIMMING/
WATER SPORTS
PROLONGED
SWIMMING/
FREE DIVING
SCUBA
DIVING
PROFESSIONAL
DEEP SEA DIVING
Note: The tachymeter indications may
appear on dial ring, rather than on the
outer bezel (depending on model).
As shown in the illustration, it takes
the vehicle 45 seconds to travel 1km
so the approximate average speed is
80kph (50 mph).
(e.g.) Based on how many seconds it
takes a vehicle to travel 1km or 1 mile
(the available measuring range is up to
60 seconds), the average speed within
the distance can be calculated.
1. Start the chronograph when the
vehicles commence travel.
2. After the vehicle has travelled
1 km/1mile, stop the chronograph.
The approximate average speed within
the distance can be determined by
observing the present position of the
second hand and reading the outer
bezel.
USING THE TACHYMETER
The most common use of a tachymeter
is for measuring the approximate
speed of a vehicle over a known
distance.
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