What is the typical signal level of the ECG EKG measured on the skin?

The typical signal level of an ECG (electrocardiogram) measured on the skin is usually in the range of 1 to 10 millivolts (mV). The signals can be quite small, generally around 1 mV, which represents the electrical activity of the heart as it contracts and relaxes. Due to this low amplitude, ECG signals require sensitive equipment for accurate measurement and analysis.