BATTERY REPLACEMENT
ALWAYS LEAVE BATTERY REPLACEMENT UP TO THE DEALER WHERE YOU BOUGHT THE WATCH OR TO AN AUTHORIZED CASIO DISTRIBUTOR. BE SURE TO SHOW THE FOLLOWING INFORMATION TO THE PERSON REPLACING THE BATTERY.
Attention dealer or CASIO distributor
Be sure to use the following procedure when replacing the battery.
1.Remove the back cover screws, and then remove the back cover.
2.Pull up the battery holder.
3.Remove the old battery and load a new one.
4.Close the battery holder.
5.Touch the AC contact and the battery (+) side with metallic tweezers.
6.Replace the back cover and secure it with the screws.
7.Check the display of the watch. If the message “OPEn” is on the display, it means the back cover is not closed correctly. Remove the back cover and carefully replace it again.
*Absence of the “OPEn” message does not necessarily indicate an
Other tests are required to check for air tightness.
WARNING INDICATORS
This watch displays warning indicators to let you know when the sensor is malfunctioning and when battery power is low.
Err Display – Sensor Malfunction Warning
This message indicates malfunction of the watch’s pressure sensor circuitry. When sensor malfunction initially occurs, the watch stops taking measurements, the “Err” message appears, and a buzzer sounds for about three seconds.
•If the sensor is malfunctioning when it comes time for a barometric pressure measurement to be taken, the barometric pressure value and altitude value appears as “– – –
•Whenever there is a sensor malfunction, be sure to take the watch to an authorized CASIO distributor or Service Center as soon as possible.
Alteration of 
and Graph – Temporary Low Power Warning
Temporary low power is indicated on the display when the battery level temporarily drops below a certain level.
•Sensors are disabled while the temporary low power warning is being indicated, but the light and tones are operational.
•Very low temperature can cause the low power warning to appear even though battery power is not low. The low power warning should disappear when the watch is restored to normal temperature.
•If the low power warning appears under normal temperature, replace the battery as soon as possible.
Alteration of 
and 
– Battery Usage Warning
The watch automatically monitors your use of certain high battery drain functions. The battery usage warning display appears whenever the watch determines that your use of these functions is putting a heavy load on the battery.
•Sensors, the light, and tones are disabled while the battery usage warning is on the display.
•The following are the trigger values for the functions that are monitored for battery usage.
Light: 100 | Sensor Operations: 1,000 |
Alarm: 100 | Mode Change: 1,000 |
•The battery usage warning appears whenever any single function is performed the number of times noted above, or for any proportional number of operations of multiple functions (such as 50 light operations and 50 alarm operations, 50 light operations and 500 mode change operations, etc.).
•The monitor counter continues to be incremented as long as the duration between two high power drain operations is less than 15 minutes. The counter is reset to 0 whenever 15 minutes pass between operations.
Display – Low Power Warning
The low power warning appears to let you know that battery power is low.
•Sensors, the light, and tones are disabled while the low power warning is on the display.
•The low power warning may appear under very low temperatures, although battery power is not low. Correct operation should resume when the watch returns to normal temperature.
•If the low power warning appears under normal temperatures, have the watch’s battery replaced as soon as possible.
•Be sure to read “BATTERY REPLACEMENT” before trying to replace the battery.
ABOUT ALTITUDE AND BAROMETRIC
PRESSURE MEASUREMENTS
Altimeter
Generally, barometric pressure and temperature decrease as altitude increases. This watch bases its altitude measurements on International Standard Atmosphere (ISA) values stipulated by the International Civil Aviation Organization (ICAO), which define relationships between altitude, barometric pressure, and temperature.
| ALTITUDE | BAROMETRIC PRESSURE | TEMPERATURE | ||||||||||||
| 6000 m | 472 hPa/mb | About 6.7 hPa/mb per 100 m |
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| 5500 m |
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| 540 hPa/mb |
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| 5000 m | About 7 hPa/mb per 100 m |
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| 4500 m | 616 hPa/mb | About 8 hPa/mb per 100 m |
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| 4000 m |
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| 3500 m | 701 hPa/mb |
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| About 6.5°C | ||||||||
| 3000 m | About 9 hPa/mb per 100 m |
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| 2500 m | 795 hPa/mb |
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| 2°C |
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| 2000 m | About 10 hPa/mb per 100 m |
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| 1500 m | 899 hPa/mb | About 11 hPa/mb per 100 m |
| 8.5°C |
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| 1000 m |
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| 500 m | 1013 hPa/mb | About 12 hPa/mb per 100 m |
| 15°C |
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| 0 m |
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| Source: International Civil Aviation Organization |
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| ALTITUDE | BAROMETRIC PRESSURE | TEMPERATURE | ||||||||||||
| 20000 ft |
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| 13.76 inHg | About 0.119 inHg per 200 ft |
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| 18000 ft | 16.22 inHg |
| About 0.1315 inHg per 200 ft |
| 2.0°F |
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| 16000 ft |
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| 14000 ft | 19.03 inHg |
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| 16.2°F |
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| 12000 ft |
| About 0.15 inHg per 200 ft |
| About 3.6°F | ||||||||||
| 10000 ft | 22.23 inHg |
| About 0.17 inHg per 200 ft |
| 30.5°F |
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| 8000 ft |
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| 6000 ft | 25.84 inHg |
| About 0.192 inHg per 200 ft 44.7°F |
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| 4000 ft |
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| 2000 ft | 29.92 inHg | About 0.21 inHg per 200 ft |
| 59.0°F |
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| 0 ft |
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Source: International Civil Aviation Organization
There are two standard methods of expressing altitude: Absolute altitude and relative altitude. Absolute altitude expresses an absolute height above sea level. Relative altitude expresses the difference between the height of two different places.
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| Height of building 130 m |
| Rooftop at an altitude of | |||||||||
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| 230 m above sea level | ||||||||||
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| (Altitude above sea level) | ||||||||||
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Sea
Barometer
Barometric pressure indicates changes in the atmosphere, and by monitoring these changes you can predict the weather with reasonable accuracy. Rising barometric pressure indicates good weather, while falling pressure indicates deteriorating weather conditions.
The barometric pressures that you see in the newspaper and on the TV weather report are measurements corrected to values measured at 0 m sea level.