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Scientific Laboratory Stopwatch

Precision stopwatch with lap recording, per-lap observations, and data export in CSV format.

Try this tool

Lab Stopwatch

Standby
00:00:00.000
enterStart/Pause·spaceLap

When to use this tool

Measuring reaction times, chemical kinetics, free-fall times, oscillation periods, and any experiment requiring time measurement.

How it works

Start, pause, and record laps with keyboard shortcuts. Each lap can include an observation. When finished, view statistics (mean, std. dev., min/max) and export data as CSV.