ECG 7-step ruler: transparent ID-sized cards make ECG interpretation simple. With -by-step process, there are reference points along the way, which are suitable for those key points that are difficult to remember! The right size is just the right size, which can be put into an ID card folder for easy storage and access. The 7-step ECG interpretation method is considered in the . Clear and easy-to-read design: it adopts step-by-step layout with clear scale and guide, and is used to measure key ECG intervals, including PR interval, QRS interval, elevation/depression and T wave. Very suitable for beginners and experienced practitioners. Education and practicality: an excellent learning aid for medical students, nurses and cardiologists. The 7-step guide on the ruler provides a quick reference for ECG interpretation, saving time and enhancing confidence. Ideal for clinical environment: Anyone who is doing ECG/ECG can practice from students to experienced clinicians. This ECG ruler is an essential tool to improve the diagnostic efficiency and accuracy in a fast-paced medical environment. Colour:As Shown Material:Acrylic Package Contents: 2 * Measuring 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.