Card Holder Compatible 7 Step Ruler for Measurement and Interpretation
ab 4,48 €
Difference: A: 7-step ruler alone, B: 7-step ruler [with card holder]. B: 1 7-step ruler [with card holder]. A: 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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