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• Diving while wearing this watch is limited to recreational diving only (non-

decompression diving). Do not wear this watch during decompression diving,

saturation diving or when diving at high altitudes. Although the watch can be

worn in the water over a temperature range of +10°C to +40°C, water depth

is not displayed correctly in water other than saltwater (specific gravity:

1.025).

• Sudden atmospheric changes and changes in water temperature may affect

the display and performance of this watch. It is necessary to use the watch

in combination with other instruments in such cases. The display of this

watch should only be used for reference purposes as a rough indicator.

• Although the use of this watch is limited to recreational diving, even recre-

ational diving can be dangerous. The user is strongly recommended to use

this watch only as a supplementary instrument during diving after having first

received the proper scuba diving training from a qualified instructor, acquiring

the necessary experience and skills for safe diving, and completely mastering

the handling and operation of this watch.

4 5

CONTENTS

WARNING ................................................................................................... 3

1. Features ................................................................................................. 8

2. Use of this Watch ................................................................................. 10

A. Use During Diving B. Use of Altimeter and Barometer

3. Digital Display ...................................................................................... 18

4. Names and Functions of Components .............................................. 20

5. Setting Analog Time ............................................................................ 24

6. Changing the Mode .............................................................................. 26

7. Using the Time / Calendar Mode.......................................................... 29

A. Setting the Digital Time and Date B. Temperature Measurement

C. Display of Changes in Barometric Pressure

8. Using the Alarm Mode ......................................................................... 33

A. Setting the Alarm Time

9. Using the Chronograph Mode ............................................................. 35

A. Chronograph Measurement

Citizen C900 User Manual

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