3Pc ECG 7 Step Ruler ECG 7 Step Ruler For ECG/EKG Interpretation ECG Reference Guide Ruler EKG Calipers Measuring Tool _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ ECG 7 Step Ruler: Designed with the scientific 7-step ECG interpretation method, it provides clear, intuitive reference points for those hard to remember key points with a step-by-step follow-through process!_x000D_ Compact and Convenient: Designed to fit perfectly in your ID badge holder or pocket, this lightweight ruler ensures you have a reliable ECG interpretation tool readily accessible during your shifts or practice sessions_x000D_ Durable and Easy-to-Use: Made from high-quality plastic, the ruler is durable, easy to clean, and provides clear visibility of ECG readings for precise measurements and analysis_x000D_ _x000D_ Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you!_x000D_ Colour:Photo Color_x000D_ Material:plastic_x000D_ _x000D_ Package Contents:_x000D_ 3 x ECG 7 Step Ruler_x000D_ 3 x Storage Box_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ 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._x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_