7 Step Ruler Interpretation Measurement Tool Transparent Caliper For ECG/EKG Interpretation Clear ID Size Cards Features: 1: Clear ID size cards for easy interpretation, perfect size to fit in your card holder for easy storage and access, designed for the 7 step interpretation measurement. 7 step scale assessment tool. Step by step tracking process and landmarks to help remember those hard to remember key points! 1. Heartbeat: This will provide a quick but approximate value. 2. Rhythm: Assess if the beat is regular or irregular. 3. Axis: A quick reference to deviation from normal, left axis or right axis. An arrow pointing up indicates a positive deviation and an arrow pointing down indicates a negative deviation. 4. PR Interval: This gives you a reference for the PRI range in milliseconds. There is also a block on the right side where you can measure the PRI. 5. QRS Interval: As shown above, it gives you the QRS and QTc ranges in milliseconds, and you can use these blocks again to measure the QRS interval. 6.ST Elevation/Depression: Place the posterior straight along the isoelectric line to assess if it is ST elevation or ST depression. There is a ruler to measure the degree of both in millimeters. 7. T wave: Finally, a quick reference to possible T wave abnormalities. Remember: V1-V4= anterior septal for MI, V3-V6= anterolateral for MI. Specifications: Part Name: 7-step ruler Material: Plastic Size: As shown in the picture Color: Transparent Difference: A: 7-step ruler alone, B: 7-step ruler [with card holder] Package Contents: A: 2*7-step ruler B: 1*7-step ruler [with card holder] Note: 1. The actual color of the product may be slightly different from the picture shown on the website, which is caused by many factors such as monitor brightness and light brightness. 2. Please allow the data for slight manual measurement deviation. _x000D_ _x000D_