SuperTeacherTools
Scroll down to set the amount of time and start the countdown.
This is also available as a
Classroom Timer / Stopwatch Tool
Set the Timer:
Days
Hours
Minutes
Seconds
Message
No Sound
Alarm 1
Gong
Foghorn
Alarm?
Help:
Set the amount of time you would like the counter to keep track of (in days, hours, minutes, and/or seconds)
Optionally, you can set the message to display when time runs out
Start the clock
You can pause or resume the clock with the blue and white pause/play button