Lab timer settings

Sound cues apply to the repeatable countdown. Stopwatch laps stay silent.

SoundFinal beeps

Space stopwatch / L lap / C countdown / R reset / T repeat / F fullscreen

Stopwatch + Laps

mm:ss.cc

0:00.00

Ready

Max laps

Laps (newest first)

Start the stopwatch, then press L to record laps (splits).

Repeatable Countdown

step timer

Common step times

Countdown setup

Custom step (seconds)

Repeat step

If Repeat is on, the countdown restarts automatically after it hits zero.

1:00

Step Countdown - Repeat on - Ready

C start/pause - R reset - T toggle repeat - F fullscreen

Lab Timer (Experiments + Reaction Time)

Use a stopwatch with laps and a repeatable countdown for timed lab steps, optional sound, and fullscreen step timing.

Two timing modes for a procedure

Stopwatch mode measures open-ended elapsed time and records laps. Step mode counts down a selected short duration for a repeatable procedure. The quick second presets load the step duration.

Start the stopwatch and press Lap at each observation to keep timestamps. For a repeated 60-second step, set 60 seconds and restart that step for each sample. Reset clears the active mode's current timing data.

Recordkeeping boundary

The lap list is a session aid, not a laboratory record system. Refreshing or closing the page removes it. Browser and input latency affect recorded times, and device sleep can interrupt countdown cues. Export required observations into the appropriate record before leaving the page.