**25 mm/s is the standard ECG paper speed.**
It means the ECG tracing moves at **25 millimeters per second**.
At this speed:
- Each small square (1 mm) = **0.04 seconds** (40 ms)
- Each large square (5 mm) = **0.2 seconds** (200 ms)
This is the universal default for routine ECGs (along with 10 mm/mV calibration, also shown in your image). It lets you accurately measure intervals (PR, QRS, QT) and calculate heart rate.
Your lead II strip is recorded at the correct standard speed.
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