Features: The electrocardiogram 7 step ruler is a essential tool for accurate electrocardiogram interpretation, designing to assist healthcare professional in analyzing complex cardiac data with ease. This portable pocket sized ruler card features a clear and concises 7 step guide, ensuring it remain a reliable reference in any medicals setting. For cardiologists, nurses, and medicals students, this electrocardiogram assessment tool enhances learning and supports professional practice by providing quick and precise measurements. Widely utilized in hospitals, clinics, and educational environment, the electrocardiogram 7 step ruler offers dependabled support for electrocardiogram analysis, making it a valuable addition to any medicals toolkit. This electrocardiogram ruler card is not a diagnostic device but serves as a practical aide for interpreting electrocardiogram result, reinforcing its role as a must having accessory for medicals professional. Specifications: Component:Plastic Size:Approx.8.6x5.4cm/3.38x2.12inch Quantity:2pcs/3pcs/4pcs Package Includes: 2pcs/3pcs/4pcs 7 Step Ruler Card note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.