Nokia 6555 User Manual page 85

To have an interval timer with up to 10 intervals started, first enter the intervals.
Select Menu > Organizer > Countd. timer > Interval timer. To start the timer,
select Start timer > Start.
Stopwatch
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You can measure time, take intermediate times, or take lap times using the
stopwatch. During timing, the other functions of the phone can be used.
To set the stopwatch timing in the background, press the end key.
Using the stopwatch or allowing it to run in the background when using other
features increases the demand on battery power and reduces the battery life.
Select Menu > Organizer > Stopwatch and from the following options:
Split timing — to take intermediate times. To start the time observation,
select Start. Select Split every time that you want to take an intermediate
time. To stop the time observation, select Stop.
To save the measured time, select Save.
To start the time observation again, select Options > Start. The new time is
added to the previous time. To reset the time without saving it, select Reset.
Lap timing — to take lap times
Continue — to view the timing that you have set in the background
Show last time — to view the most recently measured time if the stopwatch
is not reset
View times or Delete times — to view or delete the saved times
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