7 Step Ruler Measurement Tool for Accurate Card Interpretation and Assessment
ab 6,06 €
Difference: A: 7-step ruler alone, B: 7-step ruler [with card holder]. A: 1 7-step ruler. B: 2 7-step ruler. Rhythm: Assess if the beat is regular or irregular. PR Interval: This gives you a reference for the PRI range in milliseconds.
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