It is really good, but...
Has a major flaw that hurt the score. There's no zoom in function for the ECG image. I would give 3,5/5 because of that.
Not enough ratings yet to assess ECG Master.
ECG Master - Quiz, Exam, Explanation, Statistic appears to be a legitimate app. AppsHunter Legitimacy Score for ECG Master is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.