Thank you for viewing. This is a set of two standard textbooks for learning electrocardiograms (ECGs). It's perfect for those aiming to pass the certification exam, as well as those who want to be able to read ECGs in a clinical setting. 【Condition】 There are some scratches and signs of use on the front and back covers. There are no tears, and there are no problems with reading or studying. The ECG drill book has underlining on multiple pages, so please understand that it is a used item. The official ECG certification problem book has no writing or underlining.