Citizen CTZ-B6810 User manual

CITIZEN QUARTZ
Eco-Drive
World Time
Model No. JROXXX Cal. No. C60
• INSTRUCTION MANUAL
CTZ-B6810
•Several types with different design
are also available.
When reading this instruction manual please keep
the watch diagram above unfold and in view.
Symbols used in the sections on operating
instructions refer to the symbols indicated in this
diagram. Thank you for purchasing a
CITIZEN QUARTZ WATCH.
To ensure correct use, please read these
instructions carefully. Please confirm that the
Citizen International Guarantee Card is
included for your possible claim.
1. Main Features
this analog/digital combination solar watch works on
Citizen’s environmentally clean Eco-Drive system.
the Eco-Drive converts the energy oflight to electrical
energy using the solar charger set in the dial of the
watch, generating power to operate various analog
and digital functions. the watch also has the world
time display function. by operating the button, you
can easily check the time and day in 24 major cities
of the world.
2. Before Use
If the solar battery is insufficiently charged, you
cannot operate the watch as explained in the
instruction manual.
To recharge, place the watch under a fluorescent or
incandescent lamp at a distance of approx. 20 cm for
approx. 40hours, or under direct sunlight for approx.
one hour. The secondary battery is an
environmentally clean energy source since it
does not contain mercury or other pollutive
materials. Once the battery is charged to the full,
the watch will keep on running for 2.3 months
without recharging.
• For Trouble Free Use
Be sure that the solar battery is sufficiently
charged to ensure smooth operation ofAlarm,
Chronograph and other functions. The watch has an
Overcharge Prevention function. You can charge the
battery without worrying about overcharging. We
recommend that you recharge the watch every
day.
3. Part Names and Functions Fold out the watch
diagram at the beginning of this instruction manual
and refer to the location of the parts.
4. Special Functions of the Solar Powered Watch
If solar battery becomes insufficiently charged, a
warning function comes into operation and the
display changes, as below.

(When the watch is
insufficiently charged)
(1) If the watch has been set
to Time or Calendar
mode, it will keep the
mode in use when
Insufficient Recharging
Warning was shown.
•In this state, you can
switch modes between
Time and Calendar and
adjust display.
(2) If the watch has been set
to alarm, Chronograph,
Timer or Zone Set mode,
it will automatically
switch to Time display mode.
(3) If Chronograph measurement or Timer
countdown is in progress, the watch will
automatically stop operation and switch to time
display mode from reset mode.
(4)Alarm will not sound
(5) “CHARGE” will appear in digital display-1.
(When the watch is sufficiently recharged)
(1) Insufficient Recharging Warning (“CHARGE”
mark) disappears and the watch returns to normal
time or Calendar mode.
(2) Mode switching by the M button will become
active when the Insufficient recharging
warning has released. In this case, readjust
the display of each mode before use.
Insufficient Recharging Warning Feature
Analog display: Second hand starts advancing 2
seconds at a time indicating the
watch is insufficiently charged.
The watch keeps correct time even
when power charge is insufficient.
the watch will stop unless this
condition is not corrected within
about 3 days.
Digital display: “CHARGE” appears in digital
display-1.
Quick Start Feature
The watch will stop if solar battery has completely
lost its power charge. When watch face is exposed to
light, Second hand will start advancing irregularly
hitch movement after approx. 10 seconds (Time
Reset Indicator). Length of time required for
restarting Second hand will depend on intensity of
light. If light is blocked when solar battery is not fully
charged, the watch will stop again.
Time Setting Indication Feature
If the watch is exposed to light after it has stopped, it
will activate the Quick Start function and start moving
again. However, Second hand will show hitch
movement to indicate the need to reset to the correct
time. In this case, reset time. Otherwise, Second
hand will continue to show irregular movement. If
time is reset when power charge is too low,
Insufficient Recharging Warning and Time Reset
Indicator (Second hand hitch movement) will appear
again.
• Be sure to setAnalog Time, Calendar and other
modes after adjusting display to the correct time.
Overcharging Prevention Feature
When secondary battery is charged fully,
Overcharging Prevention function will activate
automatically.
Special care for using solar watch
Make sure that solar battery is always charged to
sufficient level. When you are wearing clothes with
long sleeves, power charge may become too low
because the watch is not exposed to light.
•Always keep the watch exposed to light when not
using it. This will assure correct running of the watch.
WARNING Never use batteries other than the
secondary battery specified for this watch. The
watch is not structurally designed to operate on any
other type of battery. However, if by chance a silver
battery or other batteries are used, their is a danger
that the battery will be overcharged and burst
causing damage to the watch and the user. When
replacing secondary battery, be sure to use the
designated product.
Recharging solar watch
CAUTION The watch will be damaged during
recharging if it gets too hot (about 60C/140F or
more). Avoid recharging at high temperatures. Don’t
recharge near an incandescent lamp, halogen lamp
and other high temperature light sources or on a car
dashboard and other heat accumulating places.
• Solar battery may not be fully charged if placed in a
dimly lit place.
Time required for recharging
Recharging time differs depending on model of the
watch (colour of the dial).
The Table below shows standard time required for
recharging.
*Recharging time is length of time in which the watch
is continuously exposed to light.
Recharging time
From stopped
Illuminance Environment For one state to the Until fully
(luxes) day’s use one second charged
movement
500 Inside ordinary office 3 hours 22 hours 242 hours
20 minutes
1,000 60-70 cm under 1 hour 10 hours 120 hours
fluorescent light (30W) 40 minutes
3,000 20 cm under 35 minutes 3 hours 40 hours
fluorescent light (30W)
10,000 Exterior, cloudy 10 minutes 1 hour` 12 hours
100,000 Exterior, summer, 50 seconds 5 minutes 1 hour
sunny 50 seconds 5 minutes 1 hour
Full recharging time : time required for recharging
fully from stopped state.

Recharging time for one day’s use : recharging
time required for the watch to run for one day.
5. Setting The Analog Time Display
Time setting position
1) Pull the crown out and stop the
second hand.
2) Turn the crown and set the
hands to the correct time.
3) Press the crown back in to
finalize the setting and start the
watch.
How to adjust the watch to the correct time.
Stop the second hand at the “0” position. Move the
minute hand to a few minutes past the time you want
to set, then move it back to the correct time. Press
the crown back in synchronizing to the correct time.
6. Switching Digital Modes (Functions)
In addition to Time mode, this watch has 5 other
modes; Calendar, Alarm, Chronograph, Timer
and Zone Set.
•TheAuto-return to the Time mode will be activated
when the watch is left in the alarm, or Zone Set
mode for more than 2 minutes without any operation.
7. Using Digital Modes (Functions)
ATo Call up Time, Calendar or Alarm in Each City
(1) Press Mbutton to set the watch to Time,
Calendar orAlarm mode.
(2) Press Aor Bbutton to call up desired city.
•If Abutton is pressed, City Names and Time will
appear in downward order.
•If Bbutton is pressed, City Names and Time will
appear in upward order.
 Setting City Names and Time ON/OFF
If a City has been set “OF” (OFF) in Zone Set mode,
you cannot call up their City and its time (Calendar or
Alarm) by pressing Aor Bbutton. In this case, the
watch will call up the next City which has been set
“ON” and show its time (Calendar orAlarm).
Time Difference Between the Local Time And UTC
(Unit : hour)
Indica- City Time Indica- City Time
tion difference tion difference
UTC Universal time 0 TYO Tokyo +9
co-ordinated
LON London 0 SYD Sydney +10
PAR Paris +1 AKL Auckland +12
ROM Rome +1 HNL Honolulu –10
IST Istanbul +2 ANC Anchorage –9
MOW Moscow +3 LAX Los Angeles –8
DXB Dubai +4 DEN Denver –7
KHI Karachi +5 CHI Chicago –6
DAC Dacca +6 MEX Mexico City –6
BKK Bangkok +7 NYC New York –5
SIN Singapore +8 CSS Caracas –4
HKG Hong Kong +8 RIO Rio de Janeiro –3
BTime Mode
If you set the time for any
of the 24 cities, time of all
other cities will be
automatically adjusted.
To set to Summertime
(1) Press Mbutton to
switch to Time mode.
(2) Press Aor Bbutton to select a City.
(3) Press and hold Bbutton for 2 seconds or longer.
“ON SUM” or ‘OF SUM” will flash.
(4) Press Abutton while “ON SUM” or “OF SUM” is
flashing.
Each time Abutton is pressed, “ON” and “OFF”
change, indicating that the watch is in summertime
adjustment mode.
Note: Summertime cannot be set for UTC (universal
time coordinated).
•When Summertime is set, “SUM” will appear and
the hour will advance one unit.
Setting Time
<To adjust Seconds>
(1) Press Bbutton while in Summertime adjustment
mode. Seconds will flash.
Note: If the watch is set to UTC, press Bbutton for
more than 2 seconds. Seconds will flash for
adjustment.
(2) Press Abutton while seconds are flashing,
seconds will return to “00” and restart.
• If seconds show 30 through 59, minutes display will
advance one minute.
<To adjust Hours and Minutes>
(1) Press Bbutton while Seconds are flashing.
Minutes will flash.
(2) Press Abutton and adjust Minutes.
(3) Each time you press Bbutton, adjustment
section changes and begins to flash as shown in the
diagram on the next page.
(4) Press Abutton to adjust flashing section. Press
and hold Abutton for rapid advancement.
(5) Press Bbutton again after switching to 12/24-
hour display to return to normal time display.
<Button Operation>
BPress and hold Bbutton for 2 seconds or longer.
BPress Bbutton once.
• Make sure that theAM/PM indication is correct
when setting the time in the 12-hour display system.
•Auto-Return to the normal time display will activate
when the watch is left in the adjustment mode for
more than 2 minutes.
• While in the adjustment mode, the watch will be
directly returned to the normal time display by
pressing the Mbutton.
• When summertime is set for a certain city in the
Time mode, it will be automatically synchronized to
theAlarm and zone set mode.
Press B Button
Press A Button

CCalendar Mode
If you set Calendar for any of the 24 cities, Calendar
of all other cities will be automatically adjusted.
To adjust Calendar
(1) Press Mbutton to switch to Calendar mode.
(2) Press Aor Bbutton to select a City for
adjustment.
(3) Press and hold Bbutton for more than 2
seconds. Month will flash.
(4) Press Abutton to adjust Month. press and hold
Abutton for rapid advancement.
(5) Each time you press Bbutton, adjustment
section changes and start flashing as shown in the
diagram on the previous page.
(6) Press Abutton to adjust flashing section.
(7) Press Bbutton again to return to normal
Calendar display.
 Year Setting
•Calendar can be set from 1996 through 2099
 Auto-Calendar function
•Month end adjustment will be made automatically.
•If Calendar is set to a non-existent date (e.g.,
February 30), display will automatically show first
day of next month.
 Auto-Return function
•If the watch is left in adjustment mode for more than
2 minutes without any buttons being operated,Auto-
Return will activate and return to normal Calendar
display.
 Instant Manual Return
•Instant Manual Return to normal Calendar display
can be made by pressing Mbutton in Calendar
adjustment mode.
DAlarm Mode
Setting Alarm
(1) Press Mbutton to switch
the watch toAlarm mode.
(2) Press Aor Bbutton to
select City.
(3) Press and hold Bbutton
for more than 2 seconds. “ON”
or “OF” will flash. (When you press Bbutton at this
time, the name of the next City will appear for an
instant and then return to the City initially set.)
(4) “ON” and “OF” change each time Abutton is
pressed.
(5) Press Bbutton. Hours will flash.
(6) Press Abutton and adjust Hours.
•Press and hold Abutton for rapid advancement.
(7) Press Bbutton again. Minutes will flash.
(8) Press Abutton and adjust Minutes.
(9) Finally press Bbutton to return to normal alarm
display.
 Alarm Buzzer
•Alarm will sound for 10 seconds.
•Press any button to stop alarm buzzer.
•To monitorAlarm buzzer, press Abutton and hold
for more than 2 seconds when the watch is set to
normal alarm display. (Alarm sound will continue
while Abutton is being pressed.)
 12/24-hour display
•If the watch is set to 12-hour display in Time mode,
Alarm will also be set to 12-hour display. Make sure
thatAM/PM is correct when settingAlarm.
 Auto-Return function
•If the watch is left in alarm adjustment mode for
more than 2 minutes, it will automatically return to
normal alarm display.
•If the watch is kept in normal alarm display mode
for more than 2 minutes, it will automatically return to
normal alarm display.
 Instant Manual Return
•Press Mbutton inAlarm adjustment mode to return
to normal alarm display.
EChronograph Mode
Chronograph measures
in units of 1/100 of a
second, up to 11 hours
59 minutes, 59 seconds
and 99 hundredths
seconds.After finishing
12-hour measurement, it
will return to reset state (all digits are zero) and stop.
you can also check split times while using
Chronograph.
Elapsed Time Measurement
(1) Press Abutton to start/stop Chronograph.
(2) If Bbutton is pressed when Chronograph is
stopped, it will return to reset state.
•You will hear beep sound each time you press Aor
Bbutton to start/stop or reset Chronograph.
(Different tones will sound for start and stop.)
Split Time Measurement
(1) Press Abutton to start/stop Chronograph.
(2) Press Bbutton while Chronograph is running.
Split time will appear for 10 seconds.
•“SPLIT” will flash while split time is shown.
(3) Press Bbutton while measurement is stopped to
reset Chronograph.
•You will hear the beep sound each time you press
Aor Bbutton to start/stop or reset Chronograph
and to call up split time.

 If the watch is switched to another mode while
Chronograph is in operation (reset, measuring or
stopped) and then switched to Chronograph
again, the watch will return to the initial state of
use (if chronograph was showing split time, it will
return to measuring state).
FTimer Mode
• Timer can be set in units of
1 minute up to 60 minutes.
When Timer countdown is
finished, buzzer will sound
for approx. 5 seconds and
Timer will return to the
initially set time.
To set Timer
(1) Press Mbutton and switch to Timer mode.
(2) Press Bbutton until desired setting time is
shown. Setting time will decrease minute-by-minute
from 60 minutes. (Press and hold Bbutton to make
rapid change of setting time.)
To use Timer
(1) Press Abutton to start Timer.
(2) To stop timer, press Abutton while countdown is
in progress. Press Abutton to start it again.
(3) If you press Bbutton while time is stopped, timer
will return to the initially set time.
•You will hear a beep sound each time you press A
button to start/stop or reset Timer. (Different tones
will sound for start and stop.)
(4) When Timer countdown is finished, watch will
sound for approx. 5 seconds, after which Timer will
automatically return to the initially set time.
If the watch is switched to another mode while
Timer is in operation (countdown is in progress or
stopped) and then switched to timer again, the watch
will return to initial state of use. If countdown has
been completed, the watch will return to the initially
set time.
GZone Set Mode
• Using Sone Set function,
you can preselect desired
Cities from among 24 major
cities of the world and easily
all up on the watch local
time of any of these Cities.
To use Zone Set
(1) Press Mbutton to switch to Zone Set mode.
(2) Press Aor Bbutton to select desired Cities.
(3) Press and hold Bbutton for more than 2
seconds. “ON” or “OF” and the City name will flash.
(When you press Bbutton at this time, the name of
the next City will appear for an instant and then
return to the City initially selected.)
(4) Press Abutton and set each City “ON” or “OF”.
(5) If you press Bbutton at their stage, “ON SUM” or
“OF SUM” will flash for Summertime setting.
(6) Press Abutton to set Summertime “ON” or “OF”.
(7) Press Bbutton to select next City. Then repeat
operations (4) through (6) to set a new City “ON”.
(8)After setting of each city is completed, press M
button to return to normal Zone Set display.
Summertime
•If Summertime is set “ON” in Zone Set mode,
display in time and alarm modes will be also
switched to Summertime and show time one hour
later than standard local time.
 Auto-Return
•If the watch is left in adjustment mode for more than
2 minutes without any operation, it will automatically
return to normal zone Set mode.
•If the watch is kept in zone Set mode for more than
2 minutes without any operation, it will automatically
return to normal time display.
 Instant Manual Return
•If you press Mbutton in adjustment mode, the
watch will return to normal Zone Set mode.At this
time, it will show city name which was on display
when the watch was set to adjustment mode. If this
city has been preset “OF”, the watch will select
another city in upward order and show next city
which has been present “ON”. If all cities have been
preset “OF”, it will return to UTC.
Switching mode from Zone Set to normal Time
display
•If you switch mode from Zone Set to normal Time
display and then reset to Zone Set, the watch will
show city name which was on display when mode
was switched. If you have changed city selection in
Time or Calendar mode, newly selected city will be
shown in Zone Set mode.
City Name Display
•You can set a city “OF” in Zone Set mode after
setting this city “ON” in Time Calendar orAlarm
mode. In this case, if the watch is set again to Time,
Calendar or alarm mode, it will select another city in
upward order and show next city which has been
preset “ON”. If all cities have been preset “OF”, it will
return to UTC.
8. All Reset Function
UseAll Reset function to reset
the watch after replacing
secondary battery or if the watch
is showing abnormal operation
or display.All Reset function can
be performed as follows:

(1) Press A,Band Mbuttons simultaneously for
more than 2 seconds. all digital displays will
disappear. (If any one of the buttons is released,
all displays will reappear.)
(2) Release all 3 buttons. the watch will restart
from12:00 UTC.
(3) You will hear a beep sound 2 times indicating All
Reset is complete.
(4)Adjust Time, Calendar and other modes to the
correct time before use.
9. Precautions
1) Resistance to water
Refer to the table for water-resistance performance
after checking the water-resistance characteristics
inscribed on the face and back of the watch.
• Always set the crown in the normal position.
• While working with water or using it as a water-
resistant sports watch, if the watch is dipped in
seawater or after a lot of sweating, please rinse it
well in fresh water and dry it thoroughly with a soft
cloth.
• Leather straps have characteristics that may affect
durability after getting wet.
• Because there is always air inside the watch, when
the air temperature outside remains temporarily,
there is no problem, but if it doesn’t disappear after
a long period of time, please consult the shop you
purchased it from or another Citizen dealer.
2) Avoid temperature extremes
Avoid leaving your watch in direct sunlight or in
extremely warm locations for long periods of time.
3) Avoid wet conditions
Do not operate the crown or pushbuttons when your
watch is wet.
4) Avoid strong shocks
5) Avoid strong magnetic fields
6) Avoid Static Electricity
The integrated circuits used in your watch are
sensitive to static electricity. If exposed to intense
static electricity, the watch’s display may lose its
accuracy.
7) Avoid chemicals, and corrosive gases
Avoid wearing your watch in the presence of strong
chemicals, solvents and gases. If your watch comes
in contact with materials such as gasoline, benzine,
paint thinner, alcohol, spray cosmetics, nailpolish,
nail polish remover, adhesives or paint, discoloration,
deterioration or damage to the case, band or their
components may occur.
8) Photosensitive eyeglasses
The watch’s digital display may become difficult to
read clearly when wearing photosensitive
eyeglasses or sunglasses such as ski goggles and
tinted fishing glasses. This problem can be corrected
by turning your wrist slightly to change the angle
between the eye and watch, providing a clear view of
the display.
9) Keep your watch clean
Wipe off any water and moisture that adheres to the
case, glass or band with a soft, clean cloth.Any dirt
left on the case or band may cause skin rash.A
watchband will easily become soiled with dust and
perspiration since it is in direct contact with the skin.
Even a stainless steel or gold-plated band may begin
to corrode if it has not been cleaned for a long period
of time. Mesh bands, because the mesh is very fine,
will lose their particular “flexibility” if they are left
soiled for a long time.
Metal watchbands are usually washed with a brush
in mild, soapy water, rinsed and wiped with a soft,
absorbent cloth to make sure all water is removed.
Exercise care to prevent any water from getting
inside your watch when the band is washed.
10) Periodic inspection
Getting your watch checked once every year or two
is recommended to ensure long use and trouble-free
operation.
11) Watch bands
Metal bands: Metal watch bands can be cleaned with
a toothbrush, soap and water.
Leather bands: Wipe off the front side of the band
with a soft dry cloth, and remove stains on the back
side of the band with a cloth moistened in alcohol.
Plastic or rubber bands: Wash in water. (Avoid using
solvents as they may cause the band to dissolve).
Check the chart to determine the water resistant
properties of this watch.

12) Be sure to keep secondary batteries out of
reach of infants and small children. Should
accidental ingestion occur, consult a doctor at
once.
10. Specifications
(1) Caliber No.: C61∞
(2) Type:Analog/digital combination display solar
watch
(3)Accuracy: 20 seconds per month at 5-35˚C (41-
95˚F) when used in normal temperatures.
(4) Operating temperature range : 0-55˚C (32-131˚F)
(5) Display functions:
Time: Hours, Minutes, Seconds, 12/24-hour
display, Summertime, City time zone setting
Calendar: Month, Date, Day (Year), City time
zone setting
Alarm: Hours, Minutes (AM/PM), ON/OFF,
City time zone setting
Chronograph: 12-hour measurement (in
1/100 sec.),
Split time measurement
Race Time: 15 different lengths of Setting
(Auto-chrono: 12hour measurement, 1
second unit)
(6)Additional functions: Insufficient recharging
warning feature
Quick Start feature
Time setting indication feature
Overcharging prevention feature
*These specifications are subject to change for
product improvement without prior notice.

Water Resistance
The water-resistant quality of our timepieces is offered in varying degrees depending on the model. This
ranges from non-water resistant models to those suitable for SCUBA diving. Water resistance of our
timepieces is measured in BAR or Barometric Pressure. Each BAR of pressure is equal to 14.5 pounds per
square inch of pressure.
Water resistance is measured when the watch is at a static, or motionless state. As the watch is moved in
water, such as from the motion of swimming, pressure is added from velocity. While you may be swimming in
a pool at surface level, the watch may be experiencing forces equal to that of 100 feet of water pressure
(3 BAR). Diving into a pool can cause forces on the watch to exceed those pressures. As such, you
should always allow a margin of safety when exposing your watch to moisture. Never "push the limit" of
the degree of water resistance of your timepiece.
A primary factor to keep in mind about water resistance is that periodic maintenance is needed to
maintain original factory specifications for water resistance. When a watch is new, it meets
specifications for water resistance as indicated on the case back. However, as the watch ages, the
gaskets that seal the watch become dry and brittle, diminishing its water resistant quality. Exposure to
environments such as chlorinated pools, salt water or soaps from showering can accelerate drying of the
gaskets. We recommend that the gaskets be changed at least every 18 to 24 months to maintain the water
resistant quality of your timepiece. If the watch is frequently exposed to chlorinated pools, soaps salt
water, etc., we recommend that the gaskets be changed on a yearly basis.
From time to time, you may notice condensation that appears then goes away after a short period of time.
This is a normal occurrence and happens primarily from sudden temperature changes. When there are sudden
temperature changes such as entering a cool building from the hot out of doors, or jumping into pool on a
hot day the watch may fog. Conversely, if you go to the cold outdoors from a warm building, fogging may
occur. As long as the fogging clears in a short period of time, there is no need for concern.
Be sure the crown is completely pushed in prior to any contact with moisture. If your model is equipped
with a screw down crown, be sure it is properly seated against the case. Do not operate the crown or any
push button when the watch is wet as this may allow the entrance of moisture. . If at anytime, you notice
moisture in your timepiece that does not clear in a short period of time, you should send your timepiece
as soon as possible to the nearest Authorized Service Center for inspection.
You can determine the level of water resistance of our watches from the markings on your case-back.
Additionally, models that are water resistant to 100 or 200 meters have an indication on the dial as
well. The case-backs and dials are normally marked as follows:
The case back has no indication of water resistance
This indicates the watch is a non water-resistant model and is not designed for contact with moisture at
all. Caution should be exercised to avoid any contact with moisture, such as when washing your hands or
from a rainstorm.
“Water Resist”
This watch is designed to withstand water from accidental splashing, such as from washing your hands or
rain. Any submersion into water may result in the entrance of moisture.
“Water Resist 10BAR” or “W.R. 10BAR”, Dial marked “WR100”
This watch is designed to withstand water pressure up to 333 feet. This includes water exposure from
accidental splashing and rain, but also from showering, swimming in a pool and snorkeling. Be sure to
rinse the watch with fresh water after exposure to a chlorinated pool, salt water, soaps, etc. After
rinsing with fresh water, be sure to dry the exterior with a soft cloth.
“Water Resist 20BAR” or “W.R. 20BAR”, Dial marked “WR200”
This watch is designed to withstand water pressure up to 666 feet. This includes all exposure to water up
to and including recreational SCUBA diving. Be sure to rinse the watch with fresh water after exposure to
a chlorinated pool, salt water, soaps, etc. After rinsing with fresh water, be sure to dry the exterior
with a soft cloth.
Special Note about Jacuzzis and Hot Tubs
The various components used in the manufacture and assembly of your watch expand at various rates. This
results in a loss of the sealing capabilities of gaskets, which may allow moisture to enter. In addition,
heat from these sources can cause deformation of certain materials leading to mechanical failures. For
these reasons, you should remove your watch before entering a hot tub or Jacuzzi.