HEART Ruler: This 2.5 x 10 inch laminated pocket guide is “worth the whole course”. This tool guides helps to systematically detect hypertrophy, interval abnormalities, electrical axis, STEMI, non-STEMI, ischemia, abnormal T-waves. It lists Triad recognition of LBBB, RBBB, LAFB, WPW.
Rhythms Ruler: This laminated pocket guide ruler gives the salient points for the most commonly encountered Rhythms in clinical practice.
Both are great products for quick clinical reference and review!