From the menu page, select SETUP > TIMER.

SHOW TIMER PAGE?

Enables the timer page.

COUNT DOWN FROM:

Sets the time increment for the countdown timer. You can use the COUNT UP option to use the timer as a stopwatch.

WHEN EXPIRED:

Sets the timer to stop, count up, or repeat when the time expires.

EXPIRED TONE:

Sets the audible alert that sounds when the time expires.

INTERVAL TONE:

Sets the audible alert that sounds when the interval time expires.