Closing the tab stops this timer, and device sleep or browser restrictions can delay its display and alarm. These limits make it unsuitable for time-critical medical procedures.

A practical way to use the display

Use the online countdown for ordinary practice presentations, classroom activities or planning discussions. Use appropriate approved equipment and procedures for clinical timing; this tool provides no emergency protocol.

Open the timer

Use the free classroom timer to set minutes and seconds, pause or stop, and choose the display and alarm settings. Keep the tab open and the device awake while timing.