Overview
The 12-lead ECG button opens a dialog with three rows of four short leads and a long Lead II strip. All short leads show the same 2.5-second interval; the long strip covers 10 seconds.
Pause freezes the shared monitor and exposes Interpretation. Close returns to the underlying page. Resume restarts playback.
The displayed grid/gain is a screen convention rather than physically calibrated paper speed. Read Recording for the current scale and interval details.