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Read This

Read it the same way every time.

Calibration 25 mm/s · 10 mm/mV · small box 0.04 s / 0.1 mV · big box 0.20 s
Method

Read every strip in the same order: rate, regularity, P waves, PR interval, QRS width. Rate: 300 divided by the large boxes between two R waves (1500 by small boxes for precision). If the rhythm is irregular, count the QRS complexes in 6 seconds (30 large boxes) and multiply by 10.