Our laminated medical cards provide the most important information on specific topics in a clear and concise manner. These practical, sturdy, easy-to-read reference cards are a must for the medical professional or interested lay person. The ECG Ruler Professional card provides frequency scales (1x RR 50mm/s, 2x RR 25mm/s - 2x RR 50mm/s, 3x RR 25mm/s - 3x RR 50mm/s); amplitude; PQ, QRS-QT, t(s) scale for 25mm/s + 50mm/s; mm scale 0 bis 50; position types(graphical representation); position circle; graphical QRS-complex with data; and tables with cycle duration HF (1/min.) / rel. QT-duration (s) for 80%/100%/120% and HF / PQ(s) / QT(s). Size: 7.9" X 3.9"