Please note: There may be slight color difference or discrepancy in the actual product, which does not affect the use, please don't mind, thank you! Rapid Cardiac Analysis Tool - Vertical-format badge card with transparent window for EKG , color-coded myocardial segmentation, preset R-R intervals, plus guides for measuring P-R, QRS, and QT intervals. Educational use only; not a medical diagnostic device. STEMI Reference Chart - Dual-sided 12-lead diagram showing lead groupings, associated coronary vessel territories, and a ruler to measure -segment elevation/depression. ECG Rhythm Pocket Guide - Double-sided badge card featuring essential ECG rhythms, mountable both horizontally and vertically on a badge reel for easy access. Color: As Shown Material: Acrylic Package Contents: 3 * Card Badge Set 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.