P wave time limit is less than 0.12s, amplitude is less than 0.25mV. qrs wave time limit is less than 0.11s. t wave is not less than 1/10 of R wave. 1.P wave: represents the depolarization process of atrium. 1. p-wave: represents the depolarization process of the atrium. the normal time limit of p-wave is less than 0.12 s, if prolonged, the appearance of bimodal wave suggests that the left atrium is hypertrophied, and if it disappears, it can be seen in atrial fibrillation. the normal amplitude of p-wave is less than 0.25 mV, if it is more than that, it suggests that the right atrium is hypertrophied. 2. qrs wave: represents the process of ventricular depolarization. qrs has a normal time limit of less than 0.11 seconds, if it exceeds this value, it shows a wide deformed QRS wave, suggesting premature ventricular contractions. 3. T wave: represents the process of ventricular repolarization. Its amplitude is not less than 1/10 of the R-wave in the same lead; if it is lower than this value or inverted, it suggests the possibility of myocardial ischemia. If it is higher than this value, hyperkalemia may be present. It is recommended to consult a physician for appropriate investigations and treatment under medical supervision if there is any discomfort.