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EKG Heart Rate Calculator Ruler

This laminated double-sided ruler simplifies EKG readings and is a handy pocket reference tool. Use this EKG ruler to measure intervals, calculate heart rates, determine axis and reference the QRS complex. Place this ruler over your EKG strips or 12-leads for heart rate calculations and interval measurements.  


  • EKG-specific calculators for heart rate as well as PR, QRS, and QT intervals
  • EKG axis determination diagram
  • Normal EKG values for P wave, PR interval, QRS duration, QT interval, QTC interval 
  • Double-sided, laminated 

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Size6.25" L x 1.75" W x 0.875" H
Weight2 Ounces