User manual
E-32
Storage
• The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of 
this, you should store the watch away from magnets or any other sources of strong magnetism, 
including: permanent magnets (magnetic necklaces, etc.), concentrations of metal (metal doors, 
lockers, etc.), and household appliances (TVs, personal computers, washing machines, freezers, etc.)
• Whenever you suspect that the watch may have become magnetized, perform the procedure under “To 
perform bidirectional calibration” (page E-24).
E-33
Taking Temperature Readings
This watch uses a temperature sensor to measure temperature.
To take temperature readings
While in the Timekeeping Mode, press 
E
.
•
TEMP
 will appear in the lower display and temperature measurement 
will start. After about one second, the measurement reading will 
appear in the upper display.
• The watch will continue to take temperature readings every fi ve 
seconds for about two minutes.
• The watch will return to the Timekeeping Mode after the reading 
operation is complete (about two minutes).
• Pressing 
E
 while a reading operation is in progress will stop the 
operation and enter the Timekeeping Mode.
Temperature
• Temperature is displayed in units of 0.1°C (or 0.2°F).
• The displayed temperature value changes to 
- - -
 °C (or °F) if a measured temperature falls outside the 
range of –10.0°C to 60.0°C (14.0°F to 140.0°F). The temperature value will reappear as soon as the 
measured temperature is within the allowable range.
TemperatureTemperature
E-34
Display Units
You can select either Celsius (°C) or Fahrenheit (°F) for the displayed temperature value. See “To specify 
the temperature unit” (page E-36).
Temperature Sensor Calibration
The temperature sensor built into the watch is calibrated at the factory and normally requires no further 
adjustment. If you notice serious errors in the temperature readings produced by the watch, you can 
calibrate the sensor to correct the errors.
Important!
• Incorrectly calibrating the temperature sensor can result in incorrect readings.
Carefully read the following before doing anything.
–
Compare the readings produced by the watch with those of another reliable and accurate thermometer.
– If adjustment is required, remove the watch from your wrist and wait for 20 or 30 minutes to give the 
temperature of the watch time to stabilize.
E-35
To calibrate the temperature sensor
1. Take a reading with another measurement device to determine the 
exact current temperature.
2. With the watch in the Timekeeping Mode, press 
E
 to enter the 
Thermometer Mode.
3. Hold down 
A
 for about two seconds until the temperature reading 
disappears from the bottom display. Release 
A
 at this time, which will 
cause the temperature reading to fl ash, which indicates the setting 
mode.
4. Use 
E
 (+) and 
B
 (−) to calibrate the temperature value with the reading of another instrument.
• Each press of a button changes the temperature value in units of 0.1°C (0.2°F).
• To return the temperature to its uncalibrated value (OFF setting), press 
E
 and 
B
 at the same 
time.
5. Press 
A
 to return to the Thermometer Mode.
Thermometer Precautions
Temperature measurements are affected by your body temperature (while you are wearing the watch), 
direct sunlight, and moisture. To achieve a more accurate temperature measurement, remove the watch 
from your wrist, place it in a well ventilated location out of direct sunlight, and wipe all moisture from the 
case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual surrounding 
temperature.
E-36
Specifying Temperature Unit
Use the procedure below to specify the temperature unit to be used in the Thermometer Mode.
Important!
When
TOKYO
 is selected as the Home City, the temperature unit is set automatically to Celsius (
°C
). This 
setting cannot be changed.
To specify the temperature unit
1. In the Timekeeping Mode, press 
E
 to enter the Thermometer Mode.
2. Hold down 
A
 for about two seconds until the temperature reading 
disappears from the bottom display. Release 
A
 at this time, which will 
cause the temperature reading to fl ash, which indicates the setting 
mode.
3. Press 
D
 to display the current temperature unit in the upper display.
4. Press 
E
 to toggle the temperature unit between 
°C
 (Celsius) and 
°F
(Fahrenheit).
5. After the setting is the way you want, press 
A
 to exit the setting 
screen.
E-37
Checking the Current Time in a Different Time Zone
You can use the World Time Mode to view the current time in one of 31 time zones (48 cities) around the 
globe. The city that is currently selected in the World Time Mode is called the “World Time City”.
• You also can swap the current World Time City and Home Time City in the World Time Mode (page 
E-39).
To enter the World Time Mode
Use
D
 to select the World Time Mode as shown on page E-8.
• The mode dial hand will point to 
WT
, and the current city code and city 
name will scroll across the lower display. After that, the city code will 
remain shown in the lower display. You can scroll the city code and 
city name again by pressing 
A
.
• The digital meter shows the seconds count.
• The hour, minute, and second hands will indicate the current 
Timekeeping Mode time.
Currently selected 
World Time City
Current time in the currently
selected World Time City
Currently selected 
World Time City
Current time in the currently
selected World Time City
E-38
To confi gure World Time City and summer time settings
1. In the World Time Mode, use 
E
 (East) to scroll through city codes.
• For details about city codes, see the “City Code Table” at the back of this manual.
• Holding down 
E
 will scroll at high speed. 
• Pressing down 
B
 and 
E
 at the same time will jump to the UTC city code.
2. To toggle between summer time (
DST
 in the upper display) and standard time (
DST
 not displayed), 
hold down 
A
.
DST indicator
Hold down A
• Using the World Time Mode to change the DST setting of the city code that is selected as your 
Home City also will change the Timekeeping Mode time DST setting.
• Note that you cannot switch between standard time/daylight saving time (DST) while UTC is 
selected as the World Time City.
• Note that the standard time/daylight saving time (DST) setting affects only the currently selected 
city code. Other city codes are not affected.
E-39
Swapping the Home City and World Time City
You can use the procedure below to swap your Home Time City (whose time is indicated by the hands) 
with your World Time City (whose time is indicated by the digital display). 
This function comes in handy for those who often travel between two different time zones.
• You need to confi gure starting Home City and World Time City settings before performing the 
procedure below.
 To confi gure Home City settings (page E-13)
 To confi gure World Time City and summer time settings (page E-38)
To swap your Home Time and World Time Cities
Press
A
 and 
B
 at the same time.
• The times indicated by the hand (Home City time) and on the digital display (World Time City time) will 
be swapped with each other.
$ and %
New World Time 
City and Time
Home City [LON] Time
Current World Time 
City and Time
Home City [TYO] Time
Operation Guide 5415








