ECG 7 Step Ruler: A transparent ID sized card making ECG interpretation easy.With a follow along process with reference points along the way for those hard to remember key points! Perfect Size: Perfect sized to fit in your ID card holder for easy storage and access, specifically designed with the 7 step ECG interpretation method in mind. Clear & Easy-to-Read Design: Featuring a step-by-step layout, the ruler is marked with clear scales and guidelines for measuring key ECG intervals, including PR interval, QRS interval, elevation/ depression and T wave. Perfect for both beginners and seasoned practitioners. Educational & Practical: A great learning aid for medical students, nurses, and anyone training in cardiology. The 7-step guide on the ruler provides a quick reference for ECG interpretation, saving time and boosting confidence. Ideal for Clinical Environments: Anyone undertaking ECG/ EKG practise from a student up to an experienced clinician. This ECG ruler is a must-have tool for improving diagnostic efficiency and accuracy in fast-paced medical environments. Colour: Transparent Material: Acrylic Size: about 8.6x5.4x0.2cm Package Contents: 1* ECG 7 Step Ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.