Citizen 3740 User manual

EEnngglliisshh
This watch is an analog (hand) display diver's watch equipped with an elec-
tronic depth meter. The familiar watch-face format is convenient to confirm
depths while diving. Further, a chronograph function finds uses in a variety of
activities besides diving. (Please note that the depth meter function should be
used only as an auxiliary instrument.)
"Highly reliable water resistant for use at depths of up to 200 meters"
The high-reliability water resistant conforms to ISO standards for diving watches.
* ISO diving watch standards are those set forth by the International Organization For
Standardization.
<ISO/6425, 15 May 1984>
All repairs of this product, including battery replacement,
should be conducted at a Citizen Service Center. For repairs
and inspections please contact the place of purchase or contact
a Citizen Service Center directly.
3
Two models of this watch are available:one with depth readings indicated in
meters (m), the other with readings indicated in feet (ft).

Table of contents
45
Chronograph Mode·····················································································
Operating the Chronograph Mode·······························································
In these cases······························································································
When the second hand moves in 2-second increments······························
The battery··································································································
After the battery is replaced or if the hands are
in the wrong position····················································································
Using ALL RESET and adjusting the position of the hands························
When the function hand is in the wrong position·········································
Automatic time adjustment functon·····························································
Other functions····························································································
Register ring································································································
No decompression Limits············································································
Care for long term use··································································
Specifications··························································································
6
7
8
9
10
10
11
12
12·13
14
15
16
16
17
17
Diving with this watch·················································································
Safe diving···································································································
Do not use the depth meter when·······························································
Stop using this product while diving when···················································
Operating instructions················································································
Names of parts····························································································
Switching modes·························································································
Time Mode····································································································
Setting the time and date·····································································
Diving Mode·································································································
Maximum depth memo function··································································
Making accurate depth readings·································································
High altitude & freshwater diving································································
Before diving································································································
After diving···································································································
18
19
20
20
21
22
23
24
25
26
26
27
28·29·30·31
32·33

Diving with this watch
6
Diving can be a safe, enjoyable activity when diving rules are
properly followed. It is always, however, accompanied by cer-
tain risks including diver's paralysis and unanticipated acci-
dents. Before diving please obtain proper diving instruction
and be sure to conduct safety checks. Please use this watch
only after you have read and fully understood the operating
procedures and cautions in these instructions. Using this
watch other than as indicated in these instructions may result
in failure of the watch to function properly.
[ Safe Diving ]
1.Use this product only after having received proper instruction in safe div-
ing procedures.
2 .Always use the "buddy system." This watch is not a substitute for a div-
ing partner.
3.This product is recommended for sports diving to depths of up to about
30
meters(100ft), although the depth indicator will measure depths up to 50
meters(125ft).
4.Early battery replacement is recommended. A new battery will last
approximately 2 years. (However, this will vary greatly depending on the
frequency of depth meter use. Replace the battery early.) *Battery
replacement should be conducted only at Citizen Service Centers.
5.Be sure to rest sufficiently after diving, as specified by diving rules.
Riding in an airplane or moving to a high altitude too soon after diving
may cause decompression sickness.
6.Use the depth meter function of this watch only as an auxiliary or backup
instrument.
7
WARNING:

89
7.Avoid rapid ascents when diving, as these adversely affect the human
body, including causing diver's paralysis. Maintain a safe ascent speed
while diving. An ascent of 10 meters(33ft) or less per minute is recom-
mended for sports diving to avoid various possible problems.
[ Do not use the depth meter when... ]
1.In locations with altitudes exceeding 4,000 meters(13,124ft).
The watch will be unable to measure depth accurately.
2.In temperatures outside of the warranted temperature range.
The warranted temperature range for the depth meter in this watch is
from 10°C to 40°C/50°F to 104°F.
3.In potentially dangerous activities or conditions.
This watch is not designed for use in maritime emergencies or to prevent
sea disasters and the like.
4.A substitute for a pressure gauge is needed.
This watch is not designed to gauge pressures other than those associat-
ed with water depth.
5.Diving using a helium enriched environment.
This watch cannot be used in a helium enriched environment, as this
may cause malfunction or breakage.
[ Stop using this product while diving when... ]
1.The low-battery warning indicator is activated.
As the battery approaches the end of its life, the display switches automat-
ically from the depth meter display to the time display, and the second
hand begins to move in 2-second increments.
2.The watch's depth readings differ greatly from those of other depth
measuring instruments.
3.The watch stops or exhibits any abnormal functioning. (Avoid
knocking the watch against diving equipment, rocks or other hard
objects.)* Service for this watch should be conducted only by Citizen
Service Centers.
WARNING:
CAUTION:

Time Mode Chronograph Mode Diving Mode
For press Button 1.For press Button 1 continuously for 2 seconds.
1
0m
3
6
9
12
15
30
20
40
50
EXIT
.0
.2
.4
.6
.8
1
ThefunctionhandA
pointstoEXIT.
0m
3
6
9
12
15
30
20
40
50
EXIT
.0
.2
.4
.6
.8
DV
10
20
30
40
50
DV
1
Thefunction
handAand
themodehandB
bothpointto0.
The second hand F
points to 0.
0m
3
6
9
12
15
30
20
40
50
EXIT
DV
10
20
30
40
50
DV
1
Themode
handB
pointstoDV.
1
1
1
11
1
Ｕ：EXIT…ThefunctionhandpointstoEXITintheTimeMode.
Ｖ：OverZoneMark …Thefunctionhandpointstothismark(atthe53minuteposition)at
depthsoverthan50meters(125ft).
Ｗ：DV…"DV"means"diving".ThemodehandpointstoDVwhenintheDivingMode.
Ｘ：CALL…PushingButton2willdisplaythemaximumdepthmemo.
Ｙ：Pressuresensor…Measuresdepthbysensingwaterpressure
Ｚ：Depth reading units…Depth readings are indicated in meters or feet, depending on the model.
A
B
C
D
E
F
G
1
2
:
:
:
:
:
:
:
:
:
Function hand
Mode hand
Minute hand
Crown
Hour hand
Second hand
24-hour time hand
Button 1
Button 2
Name TimeMode DivingMode ChronographMode
Always displays minutes
Used to set time and date
Always displays hours
Always displays 24-hour time in conjunction with the hour hand
Used to switch modes, etc.
Used to call Maximum depth and for chronograph measurements, etc.
Points to EXIT
Points to 0
Indicates depth
Points to DV
Chronograph second hand
Chronograph minute hand
Chronograph 1/20 second hand Displays seconds
11
[ Switching modes ]
Switch between the three modes simply by pressing button1
Operating instructions
10
This watch has three modes: Time Mode, Diving Mode, and Chronograph Mode.
[ Names of Parts ]
Please read the instructions below while referring to the foldout
watch diagram located on the opening page of this manual.

13
Setting the date
1.Unscrew the crown in the indicat-
ed direction to release it, and pull it
out one step.
2.Set the date by turning the crown.
(If the crown is turned in the wrong
direction there will be no effect.)
3.Push the crown back to its original
position.
4.Hold the crown down and turn it to
screw lock it back in place.
* Setting the date between the
hours of 9 PM and 5 AM may
result in the date not changing by
the next day.
* Do not attempt to set the time or
date when in a mode other than
the Time Mode.
<When manipulating the crown...>
About the screw lock
1.Always return the crown to its original
position and lock it when finished set-
ting the watch.
2.Do not press any of the buttons while
the crown is pulled out. Doing so may
cause a mode change and disturb the
position of the hands.
3.Do not pull out or turn the crown when
it is wet. Doing so may allow water to
seep inside the watch and cause mal-
function.
Time Mode
12
EXIT
24
4
8
12
16
20
.0
.2
.4
.6
.8
DV
10
20
30
40
50
7
C
A
B
E
GF
1
Display in the Time Mode
Please refer to the fold-out watch diagram located
on the opening page of this manual.
A - Points to EXIT
B - Points to 0
C - Minute hand
E - Hour hand
F - Second hand
G - 24-hour time hand
[ Setting the time and date ]
Make sure that the watch is in the Time
Mode by confirming that the function
hand A is pointing to EXIT.
<Setting the time>
1. Unscrew the crown in the indicated
direction to release it, and pull it out two
steps. The second hand F will spin rapid-
ly and stop at 0.
2. Set the hours and minutes by turning
the crown. Check the 24-hour time hand
to confirm whether the hands are set
appropriately to AM or PM.
3. Push the crown back to its original posi-
tion.
4. Hold the crown down and turn it to screw
lock it back in place.
About the Time Mode
1. The Time Mode displays both 12 and 24-
hour time.
2. With the exception of the second hand, the time
may be read even while using the other modes.
Screw locked position Freed from the screw
locked position
: Switch to the Time Mode from the Diving Mode by pressing button 1continuously for 2 sec-
onds. Switch to the Time Mode from the Chronograph Mode by pressing button 1once.

15
Additional functions
<Auto return system>
The watch automatically returns to the Time Mode if the function hand remains at 0 meter(0ft) for longer
than 30 minutes in the Diving Mode.
<Abnormal activation prevention function >
If the depth meter is functioning abnormally for some reason, the function hand will point to the Over Zone
Mark when the watch is switched to the Diving Mode, and depth measurement will not be possible. In such a
case, switch back to the Time Mode.
Diving Mode
14
0m
3
6
9
12
15
30
20
40
50
EXIT
24
4
8
12
16
20
.0
.2
.4
.6
.8
DV
10
20
30
40
50
DV
A
B
C
E
G
F1
Display in the Diving Mode
Please refer to the fold-out watch diagram
located on the opening page of this manual.
A - Depth indicator hand (function hand)
B - Points to DV
C - Minute hand
E - Hour hand
G - 24-hour time hand
F - Second hand
* If the hands A, B do not point to the correct position,
please readjust them according to the "ALL RESET" instruc-
tions on page 23.
Reading the Depth
While diving, the number indicated by the
depth indicator hand A (the function hand) is
the present diving depth. The depth indicator
hand begins to function at a depth of 1 meter
(5ft). It registers depths less than 1 meter (5ft)
as 0. At depths over 50 meters (125ft), the
hand stops on the Over Zone Mark (53 min-
utes) and remains there until returning to
depths less than 50 meters(125ft).
Measurements and Range
Display range: 0 m(0ft) to 50 m(125ft)
Display increment: 1 meter(2.5ft)
Measurement interval: Once/second
About depth readings
1.After switching to the Diving Mode, depth read-
ings will commence automatically when diving
begins.
2.The depth will be measured and displayed in 1 meter
(2.5ft) increments up to 50 meters(125ft).
NOTE: 1.A depth less than 1 meter(5ft) is not recorded.
2.The data in the maximum depth memo will be cleared when the battery reaches the end of its life. Be
sure to record necessary memo information in a log book.
3.The first time this function is used, it may display data that was used in product testing.
4. Depths over 50 meters(125ft) will be recorded as the Over Zone Mark.
Calling the maximum depth memo
1.While in the Time Mode or Diving Mode (a depth of 0 is displayed)
press button 2. The function hand A will display the maximum depth.
2. Pressing button 2a second time or leaving the memo displayed contin-
uously for 30 seconds will release the maximum depth memo display.
This watch automatically records the maximum depth reached during a dive (in 1 meter(2.5ft) increments). This
memo is retained until the watch is set to the Diving Mode again and a depth of 1 meter(5ft) or more is reached.
[ Maximum depth memo function ]
2
0m
3
6
9
12
15
30
20
40
50
EXIT
: From the Time Mode, or the Chronograph Mode, switch to the Diving Mode by pressing but-
ton1continuously for 2 seconds.

17
[ Before diving ]
1.Make sure that the crown is pushed all the way in and locked in place.
2.Make sure that there are no cracks or other damage to the watch band or the glass face.
Damage to the band may result in the band breaking and loss of the watch.
3.Make sure that the band is firmly anchored to the watch body.
4.Make sure that the register ring rotates properly.
5.Make sure that the time and date are correctly set.
6.Make sure that the second hand is moving correctly.
* If the second hand is moving in 2-second increments, then the battery is low. Request
battery replacement at the place of purchase, or by contacting a Citizen Service Center directly.
[ After diving ]
1.After making sure that the crown is locked in place, wash the watch free of seawater, mud and
sand using fresh water. Wipe completely with a dry cloth.
2.Do not attempt to remove the sensor cover or remove any dirt or debris clogging the sensor por-
tion of the watch using a sharp instrument. Rather, flush out such debris using fresh water. If this
fails, please consult a Citizen Service Center.
3.For general repairs and maintenance please refer to "Care for long term use" on pages 28,
29, 30 & 31.
16
[ Making accurate depth readings ]
1.Switch the watch to the Diving Mode
shortly before diving.
2.When there is a great difference
between the air and water temperature,
immerse the watch in the water for 2-3
minutes before switching it to the Diving
Mode.
3.Confirm that the mode hand points to
DV and the function hand points to 0
when the watch is switched to the Diving
Mode. If the hands are in the wrong
position please refer to ALL RESET on
page 23.
4.Avoid too rapid descents and ascents
when diving. The function hand will
not adjust quickly enough during
descents or ascents faster than about 1
meter(2.5ft) per minute. Slowdown or
stop in order to obtain an accurate
depth reading.
* Never pull out or turn the crown or
press the buttons while diving. Doing
so may cause water to penetrate the
case.
[ High altitude & freshwater diving ]
When the Diving Mode is activated, the
depth is calibrated at 0 meter(0ft) based
on the surrounding air pressure. This
enables the watch to be used while diving
at high-altitudes and/or in lakes, as long
as the Diving Mode is activated at that
altitude.
However, an accurate measurement is
not possible at altitudes over 4,000
meters(131,24ft). Do not use this watch
when diving in such places. Further, this
watch displays changes in depth based
on a standard of seawater (density
1.025). Depths indicated in fresh water
will actually be about 2.5% over indicat-
ed.
Be sure to complete appropriate safety
training before diving in fresh water or at
high altitudes.
(Example) 20 meters(50ft) (indicated
depth) x 1.025 = 20.5 meters (51.25ft)
(actual depth)

19
[ Operating the Chronograph Mode ]
Press button 1
Press button 2
Press button 2for 2 seconds
Time Mode
Time Mode
.0
.2
.4
.6
.8
DV
10
20
30
40
50
DV
1
2
1
2Start 2Stop Reset
2Start 2Stop
Restart
2Stop
Reset
Normaluse
Accumulatedelapsedtime
2
2
Repeatoperation
[ Reset ]
1
2
Themodecannotbechangedduringachronographmeasurement.
Changethemodeafterstoppingmeasurement.
Changingthemodewilldeletethedata.
1
2
2
2
=NOTE=
Chronograph Mode
18
About chronograph measurements
1.A maximum of 50 minutes may be measured by the chronograph. After 50
minutes (1/20 second=0.05 second increments) measurement will stop auto-
matically and chronograph will return to the reset position.
2.The chronograph 1/20 second hand will move for 30 seconds, after which it
will return to stand-by at the 0 position. The time measured will be displayed
when chronograph measurement is stopped.
.0
.2
.4
.6
.8
DV
10
20
30
40
50
DV
B
A
F
1
2
The chronograph display
Please refer to the fold-out watch diagram located
on the opening page of this manual.
A - Chronograph second hand
B - Chronograph minute hand
F - Chronograph 1/20 second hand
* When the watch has been switched to the Chronograph
Mode but the hands A, B, & F do not point to 0, please
readjust them as indicated in the ALL RESET instructions
on page 23.
Additional functions
<Auto return system>
The watch automatically returns to the Time Mode if the chronograph reset display remains for longer than 3
minutes.
: Switch from the Time Mode to the Chronograph Mode by pressing button
1once.

21
[ The Battery ]
a) Battery life
A new battery installed in this watch will last approximately 2 years.
Standard usage conditions
Number of dives: 30 dives/year
Duration of dives: 1 hour
Chronograph use 1 hour/day
* Battery life will vary greatly depending on the function used. Do not use the Diving Mode when
not diving.
b) The original battery
The battery in the watch at the time of purchase is one used to test the function and performance
of the
watch.Please be aware that this battery may not last for the 2 years estimated for normal batter-
ies.
c) Battery replacement
1.All battery replacements should be done by a Citizen Service Center. To replace the battery, please
contact the place of purchase or contact a Citizen Service Center directly.
2.When replacing the battery, inspection of water resistance and other parts should be conducted,
and packing
materials replaced as necessary.
3.Battery replacement will result in deletion of data in the maximum depth memo. Be sure to record
such
data in a log book, etc. before replacing the battery.
4.Leaving a dead battery in the watch may cause damage due to leaking battery fluids.
In these cases...
20
[ When the second hand moves in 2-second increments ]
Please refer to the fold-out watch diagram located on the opening page of this manual.
When the battery is low, the low-battery warning indicator causes the second hand
to move in 2-second increments. The Diving Mode and the Chronograph Mode will
return to the Time Mode. Replace the battery soon.
= NOTE =
When the low-battery warning indicator is activated, the watch cannot be
switched into the Diving or Chronograph Mode.
Time
Mode
Diving
Mode
Chronograph
Mode
Time Mode
The second hand moves in 2-second increments

23
22
[ Using ALL RESET and Adjusting the position of the hands ]
1.Unscrew the crown to release it, and pull it out two steps.
2.Simultaneously press button 1and button 2and then release them. ALL
RESET is complete if the function hand moves slightly.
3.Pressing button 2will allow the mode hand B and the function hand A to
move simultaneously. Set both of these to the 0 position. Move the two
hands forward rapidly by pressing button 2continuously.
4.Align the second hand F in the 0 position by pressing button 1. Move it for-
ward rapidly by pressing button 1continuously.
5.Set the correct time. Refer to page 12 for instructions on setting the time
and date.
6.Push the crown back to its original position, press down and turn it to screw
lock it back in place. The watch will restart in the Time Mode.
[ After the battery is replaced or if the hands are in the wrong position ]
Please refer to the fold-out watch diagram located on the opening page of this manual.
Use the following ALL RESET operation to adjust the position of the hands if:
□In the Time Mode
The function hand A does not point to EXIT.
The mode hand B does not point to 0.
□In the Diving Mode
The function hand A does not point to 0.
The mode hand B does not point to DV.
□In the Chronograph Mode
The chronograph minute hand B does not
point to 0.
The chronograph second hand A does not
point to 0.
The chronograph 1/20 second hand F does not
point to 0.
□The display is abnormal in any
other way.
0m
3
6
9
12
15
30
20
40
50
EXIT
.0
.2
.4
.6
.8
DV
10
20
30
40
50
2
1
B
A
F

25
24
[ Automatic time adjustment function ]
Be sure to complete the hand position adjustment within four minutes. If so,
the hands will spin rapidly to display correct time when you complete the
adjustment. However, take care not to turn the crown at this time as it may
cause the incorrect time to be set.
＝ NOTE ＝
1.When pulling the crown out two steps, be sure to do so on dry land when the
watch is dry.
2.This adjustment may be performed when the function hand is within 15 units of
the 0 position. Otherwise, please refer to the ALL RESET instructions on page 23.
[ When the function hand is in the wrong position ]
Please refer to the fold-out watch diagram located on the opening page of this manual.
*If, when switching from the Time Mode to the Diving Mode, the function hand
does not point to 0.
*If, when switching from the Time Mode to the Chronograph Mode, the func-
tion hand does not point to 0.
In these cases, use the crown and buttons as follows to adjust the posi-
tion of the hand.
0m
3
6
9
12
15
30
20
40
50
EXIT
Within 15 units
Within 15 units
2
1
1.Unscrew the crown in the indicated
direction to release it, and pull it out
two steps.
2.If the hand is to the left of the 0 posi-
tion, press button 2to move it for-
ward to the 0 position. If it is to the
right of the 0 position press button 1
to move it back to the 0 position.
3.Push the crown back to its original
position then press down and turn it
to screw lock it back in place.

27
[ No decompression limits ]
The range of time when it is unnecessary to stop to decompress while surfacing
from a dive is determined by the depth and time of the dive. These values are
referred to as "No Decompression Limits." Use these as estimates when diving.
No Decompression Limits, based on the American Navy Diving Manual (1985), are
printed on the band of this watch. (Some models may not have this chart.)
<Reading the chart>
DEPTH.mN.D.TIME
12m 200Min.
15m 100Min.
18m 60Min.
21m 50Min.
24m 40Min.
27m 30Min.
30m 25Min.
33m 20Min.
36m 15Min.
39m 10Min.
42m 10Min.
45m 5Min.
Example: If the diver is at 21
meters for 50 minutes or less,
then it is OK to surface without
stopping to decompress.
30
30
N.D.LIMITS
D E P T H . M
12 200
15 100
18 60
21 50
24 40
27 30
N . D . T I M E
30 25
33 20
36 15
39 10
42 10
45 5
Other functions
26
[ Register ring ]
Use the register ring to measure elapsed time.
50
40
30
20
10
0m
3
6
9
12
15
30
20
40
50
EXIT
Elapsed time is 10 minutes
<Using the register ring>
Before diving, rotate the register
ring to line up the mark with the
minute hand. Elapsed time is then
indicated by the position of the
minute hand on the register ring.
Example: In the diagram at left the
minute hand is 10 minutes past the
mark, indicating that 10 minutes
has elapsed.
= NOTE =
The register ring may only be turned
counter-clockwise (this helps prevent
unwanted movement). Do not attempt
to force it to turn clockwise.
Caution:The no decompression limit
is different depending on body condi-
tion, or personal differences. Please
use the no decompression limits on
this watch as a guide line.
When a dive requires no decompres-
sion limits make sure you follow a spe-
cialized divers manual.

replace the spring bars connecting the
watch and the band.
3) Water-resistance
• this diver’s watch is designed to resist
water pressure to a maximum depth of
200 meters. Before using this watch
under water, push in the crown and
tighten the screw lock completely.
• All services after sale including battery
replacement are provided by the Citizen
Service Center. Never have the case
back opened or the screws on the sen-
sor loosened at facilities other than the
Citizen Service Center.
• In order to maintain water-resistance,
we recommend that you have the
watch checked at the Citizen Service
Center at the time of
battery replacement
once every one or two
years.
• The case back is
marked “Don’t
Open.Service Center
Repair Only.”
4) Temperature
Avoid exposing the watch to direct sun-
light or leaving it in extremely hot or cold
locations for a long period of time.
• This will cause malfunctioning and
shorten the life of the battery.
• This may cause your watch to gain or
lose time and affect its other functions.
5) Shock
• This watch will withstand the bumps
and jars normally incurred in daily use
and while playing such non-contact
sports as golf and catchball.
•Dropping the watch on the floor or oth-
erwise imparting severe shock to it may
cause malfunctioning or damage.
6) Magnetic Fields
This watch is antimagnetic up to 60
gauss and not affected by the magnetic
fields produced by ordinary household
electric appliances. If used in the imme-
29
28
Care for long term use
Light spray,
perspiration,
light rain,
bathing etc.
Swimming, etc. Skin diving.
(Without air
tank)
Scuba diving.
(With air tank)
When diving
using a helium
enriched
environment.
Pulling out the
crown when the
watch is wet.
Indication Water-related use
Watch
Dial
Water
Resist
200m
Water resistant
200m
Water resistance
OK OK OK OK NO NO
1) Pressure Sensor
• Never disassemble the sensor cover
which protects the pressure sensor.
• Be careful that foreign objects such as
sand, dust or other matter does not
enter into the sensor. If such objects
has entered into the sensor, wash it
away with fresh water. Do not use alco-
hol, gasoline, thinner or other chemical
substances.
• If you cannot clean the sensor, bring
the watch to the Citizen Service Center.
2) Watch Band
• If the watchband shows cracks,
replace it with a new band.
• When replacing the watchband also
D
O
N
'
T
O
P
E
N
.
S
E
R
V
I
C
E
C
E
N
T
E
R
R
E
P
A
I
R
O
N
L
Y
.

31
30
diate vicinity of strong magnetism, how-
ever, the watch’s functions may tem-
porarily be affected.
7) Static electricity
The integrated circuits used in the
watch are sensitive to static electricity.
If exposed to intense static electricity,
the watch’s display may lose its accura-
cy.
8) Chemicals and Gases
Avoid wearing the watch in the pres-
ence of strong chemicals or gases. If
the watch comes in contact with such
solvents as thinner and benzine or
products containing materials such as
gasoline, nail polish, detergent or adhe-
sive, its components may discolor, dis-
solve or crack. Be especially careful to
avoid chemicals. The watchcase or
band may discolor if they come in con-
tact with mercury from a broken ther-
mometer or other equipment.
9) Luminous Display
Luminous paint is applied to the hands
of this watch for use in dark areas. This
does not cause any health problems
since the amount of lumious paint used
in the watch is well within the limit
allowed and is protected by the glass.
Even if the amount used is extremely
small, luminous paint is a hazardous
substance. If the glass is broken, bring
it immediately to the Citizen Service
Center for repair or replacement.
10) Safekeeping
If you do not use the watch for an
extended period of time, wipe off per-
spiration, soil and moisture thoroughly
and keep it in a place not exposed to
extremely high or low temperatures or
high humidity. Don’t leave a dead bat-
tery in the watch for a long time and be
sure to replace it with new one. If bat-
tery fluid leaks out, it may damage
movement components.
11) Keep Your Watch Clean
Wipe off soil and moisture from the
glass with a soft, absorbent cloth. If you
wear the watch when the back side of
the case and watchband is soiled they
may cause a skin rash as they come in
direct contact with your skin. Keep your
watch clean also to avoid staining your
cuffs. How to clean the watchband:
• Metal band Wash soiled parts with a
tooth brush in mild, soapy water.
• Plastic or rubber band Wash in water.
Do not use solvent.

Specification
1. Model
2. Accuracy of time measurements
(within normal temperature range)
3. Accuracy of depth readings
4. Display
5. Timepiece operational temperature range
6. Display functions
Analog depth meter with chronograph
±20 seconds/month
1m(5ft)〜10 m(25ft):± 1m(5ft)
11m(27.5ft)〜50m(125ft):±2m(7.5ft)
(Conditions:constant temperature and excluding mar-
gin of error by sight)
* Assured accuracy temperature range:
10°C〜40°C / 50°F〜104°F
Accuracy of depth readings is affected by surround-
ing temperatures.
Analog hand display
Time: hour, minute, second, & function hands
Depth: depth hand & mode hand
Chronograph: chronograph minute hand; chronograph
second hand; chronograph 1/20 second hand
-10°C〜+60°C / 14°F〜140°F
* Time (hours, minutes, seconds)
* Date (with fast adjustment function)
7. Additional Functions
8. IC
9. Battery
10. Battery life
* Present depth indicator: 1m(5ft)-50m(125ft) (1m(2.5ft)
increments);Depth less than 1m(5ft) indicated as 0m(0ft)
* Depth over display: When depth is more than 50m(125ft)
* Maximum depth memo display: 1m(5ft)-50m(125ft)
* Chronograph display: Maximum measured display
50 min (1/20 second (0.05 sec) increments)
* Low battery warning function
* Prevention of function during malfunction state
* Second hand stopping device
C/MOS-LSI
Battery (280-44 <SR927W>)
Approximately 2 years
Estimated conditions of use
* Number of dives: 30 dives/year
* Duration of dive: 1 hour
* Chronograph measurement: 1 hour/day
These specifications are subject to change with-
out notice.
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