The application reads the selected area of the ECG and calculates the basic parameters of the ECG:• HR; • waves amplitudes P, Q, R, S, T;• intervals RR, PQ, QRS, QT, QTс;• the position of the segment ST. The app draws the selected area of the ECG.The parameters of the ECG, with deviations from the norm are highlighted.Attention.The app reads ECG only on specially marked ECG paper.The recording speed should be 25 mm/sec.Drawings of ECG leads must be horizontal and do not touch each other.The phone camera must have autofocus.