The ECG Ruler pocketcard provides professional instructions on how to read an ECG. It is the perfect complement to our ECG pocketcard, ECG Evaluation pocketcard and ECG pocket. This clearly arranged reference card offers:
**2 x RR (25 mm/s)
**1 x RR (50 mm/s)
**3 x RR (25 mm/s)
**3 x RR (50 mm/s)
**4 x RR (25 mm/s)
**Amplitudes (mV)
**Times, intervals (s)
**Conversion: heart rate - RR interval
**Table. heart rate - PR interval - relative QT interval