Casio SGW300H-1AV User Manual

Operation Guide 3202

4

The stopwatch measures elapsed time, split times, and two finishes.

To enter the Stopwatch Mode
Use 

C to select the Stopwatch Mode (STW) as shown in 

“Selecting a Mode”.

•

 STW will appear on the display for about one second. 

Next, the display will change to show the stopwatch 
hours.

D

D

D

D

A

D

A

A

D

A

Split
(SPL displayed)

D

A

D

A

A

Split
First runner 
finishes.
Display time of 
first runner

Stop
Second runner 
finishes.

Split release
Display time of 
second runner

•

 The Stopwatch Mode can indicate elapsed time up to 23 hours, 59 minutes, 59.99 

seconds.

•

 Once started, stopwatch timing continues until you press 

A to stop it, even if you 

exit the Stopwatch Mode to another mode and even if timing reaches the stopwatch 
limit defined above.

•

 Exiting the Stopwatch Mode while a split time is frozen on the display clears the 

split time and returns to elapsed time measurement.

The countdown timer can be configured to start at a preset time, and sound an alarm 
when the end of the countdown is reached.

To enter the Countdown Timer Mode
Use 

C to select the Countdown Timer Mode (TMR) as 

shown in “Selecting a Mode”.

•

 TMR will appear on the display for about one second. 

Next, the display will change to show the countdown 
time hours.

To specify the countdown start time
1. Enter the Countdown Timer Mode.

•

 If a countdown is in progress (indicated by the 

seconds counting down), press 

D to stop it and 

then press 

A to reset to the current countdown 

start time.

•

 If a countdown is paused, press 

A to reset to the 

current countdown start time.

2. Hold down 

A until the hour setting of the current countdown start time starts to 

flash. This is the setting screen.

•

 Before the hour setting starts to flash, the message SET Hold will appear 

on the display. Keep 

A depressed until SET Hold disappears and the hour 

setting starts to flash.

3. Press 

C to move the flashing between the hour and minute settings.

4. Use 

D (+) and B (–) to change the flashing item.

•

 To set the starting value of the countdown time to 24 hours, set 0H 00’00.

5. Press 

A to exit the setting screen.

D

D

D

D

A

•

 Before starting a countdown timer operation, check to make sure that a countdown 

operation is not already in progress (indicated by the seconds counting down). If it 
is, press 

D to stop it and then A to reset to the countdown start time.

•

 An alarm sounds for five seconds when the end of the countdown is reached. This 

alarm will sound in all modes. The countdown time is reset to its starting value 
automatically when the alarm sounds.

To stop the alarm
Press any button.

You can set five independent daily alarms. When a daily 
alarm is turned on, an alarm tone will sound for about 10 
seconds each day when the time in the Timekeeping 
Mode reaches the preset alarm time. This is true even if 
the watch is not in the Timekeeping Mode.
You can also turn on an Hourly Time Signal, which will 
cause the watch to beep twice every hour on the hour.

To enter the Alarm Mode
Use 

C to select the Alarm Mode (ALM) as shown in 

“Selecting a Mode”.

•

 ALM will appear on the display for about one second. 

Next, the display will change to show an alarm number 
(AL1 through AL5) or the SIG indicator. The alarm 
number indicates an alarm screen. SIG is shown when 
the Hourly Time Signal screen is on the display.

•

 When you enter the Alarm Mode, the data you were 

viewing when you last exited the mode appears first.

1. In the Alarm Mode, use 

D to scroll through the alarm 

screens until the one whose time you want to set is 
displayed.

2. Hold down 

A until the alarm time starts to flash. This is the setting screen.

•

 Before the alarm time starts to flash, the message SET Hold will appear on 

the display. Keep 

A depressed until SET Hold disappears and the alarm time 

starts to flash.

3. Press 

C to move the flashing between the hour and minute settings.

4. While a setting is flashing, use 

D (+) and B (–) to change it.

•

 When setting the alarm time using the 12-hour format, take care to set the time 

correctly as a.m. (no indicator) or p.m. (P indicator).

5. Press 

A to exit the setting screen.

To test the alarm
In the Alarm Mode, hold down 

D to sound the alarm.

To turn an alarm and the Hourly Time Signal on and off
1. In the Alarm Mode, use 

D to select an alarm or the Hourly Time Signal.

2. When the alarm or the Hourly Time Signal you want is selected, press 

A to toggle 

it between on and off.

•

 The alarm on indicator (when any alarm is on) and 

the Hourly Time Signal on indicator (when the 
Hourly Time Signal is on) are shown on the display 
in all modes.

To stop the alarm
Press any button.

The display of the watch is illuminated for easy reading in 
the dark.

To turn on illumination
In any mode (except when a setting screen is on the 
display), press 

B to illuminate the display.

•

 You can use the procedure below to select either one 

second or three seconds as the illumination duration. 
When you press 

B, the display will remain illuminated 

for about one second or three seconds, depending on 
the current illumination duration setting.

To change the illumination duration
1. In the Timekeeping Mode, hold down 

A until the currently selected city code starts 

to flash. This is the city code setting screen.

•

 Before the city code starts to flash, the message SET Hold will appear on the 

display. Keep 

A depressed until SET Hold disappears and the city code 

starts to flash.

2. Keep pressing 

C until LT1 or LT3 is displayed in the upper left corner of the 

display.

•

 See step 3 under “To change the current time and date settings” for 

information about how to scroll through setting screens.

3. Press 

D to toggle the illumination duration between three seconds (LT3 displayed) 

and one second (LT1 displayed).

4. After the settings are the way you want, press 

A to exit the setting screen.

•

 Illumination may be hard to see when viewed under direct sunlight.

•

 Illumination turns off automatically whenever an alarm sounds.

•

 Frequent use of illumination runs down the battery.

The button operation tone sounds any time you press one of the watch’s buttons. You 
can turn the button operation tone on or off as desired.

•

 Even if you turn off the button operation tone, the alarm, Hourly Time Signal, and 

Countdown Timer Mode alarm all operate normally.

1. In the Timekeeping Mode, hold down 

A until the 

currently selected city code starts to flash. This is the 
city code setting screen.

•

 Before the city code starts to flash, the message 

SET Hold will appear on the display. Keep 

A 

depressed until SET Hold disappears and the city 
code starts to flash.

2. Keep pressing 

C until MUTE or KEY   is displayed in the upper left corner of the 

display.

•

 See step 3 under “To change the current time and date settings” for information 

about how to scroll through setting screens.

3. Press 

D to toggle the button operation tone between on 

(KEY  ) and off (MUTE).

4. After the settings are the way you want, press 

A to exit 

the setting screen.

•

 The mute indicator is displayed in all modes when 

the button operation tone is turned off.

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