Features:_x000D_ECG-7 Step Ruler: Designed with the scientific 7-step ECG-interpretation method, it provides clear, intuitive reference points for those hard to remembers key points with a step-by-step follow-through process Helps to quickly analyze-ECG_x000D_Portable And Transparent Design: Crafted in an ID-sized, transparent format, this family essential ecg-ruler fits seamlessly into badge holders, pockets, or toolkits, ensuring quick access wherever you areerfect for on-the-go use in workplaces, classrooms, or clinical settings_x000D_Material: Made from premium transparent plastic, the ruler is durable, easy to clean, and provides clear visibility of ECG-readings for precise measurements and analysis._x000D_Perfect For Learning And Practice: A must-have tool for ECG-education and practice, suitable not only for healthcare professionals but also for anyone wanting to master ECG-interpretation. Our 7 Step Ruler is a reliable companion for every setting, from classrooms to hospitals_x000D_Easy To Read Reference: This reference card allows you to measure the heart rate, and see if the PR interval, QRS complex, QT-Intervals are out of the normal range and ST-elevation/depressions, The EKG ruler will be an excellent addition to your ID badge_x000D_Notice:_x000D_1.Actual color may be slightly different from the image due to different light effect_x000D_2.Please allow 1-3cm deviation due to manual measurement_x000D_ _x000D_Description:_x000D_Size: 86mm x 54mm_x000D__x000D_Package List:_x000D_Choice 1: 1 Electrocardiogram 7 Step Ruler, 1 Card Holder_x000D_Choice 2: 1 Electrocardiogram 7 Step Ruler_x000D__x000D_