Features: 1. **7-Step Ruler:** Designed using a scientific 7-step electrocardiogram interpretation method, this ruler provides clear and intuitive reference points for key concepts, aiding in the gradual understanding of the entire process. It helps users quickly analyze electrocardiograms. 2. **Portable Transparent Design:** This essential electrocardiogram ruler is made in an ID-sized transparent format, seamlessly fitting into a badge clip, pocket, or toolkit. This ensures quick access anytime, anywhere, making it perfect for use in the workplace, classroom, or clinical environment. 3. **Easy-to-Read Reference:** This reference card allows you to measure heart rate and check if the PR interval, QRS complex, and QT interval are within normal ranges, as well as identify ST segment elevation/depression. The electrocardiogram ruler is an excellent addition to your ID badge. 4. **Durable and High-Quality Materials:** This ECG/EKG 7-step ruler is made of sturdy, transparent, wear-resistant, and waterproof materials that are easy to clean. It maintains its clarity and functionality even after long-term use in demanding environments. 5. **Ideal for Learning and Practice:** An essential tool for electrocardiogram education and practice, it is suitable for healthcare professionals and anyone seeking to master electrocardiogram interpretation. Specifications: * Material: Plastic * Product Weight: 15g * Size: 8.6 x 5.4 cm Package Includes: * 1x Ruler