3-channel ECG machine is a medical tool that uses three electrodes to capture the electrical activity of the heart. The heart muscle contracts and relaxes, sending electrical impulses that the electrodes linked to the chest, arms, and legs can sense. It creates an ECG or EKG, which is a visual representation of the electrical activity of the heart. Diagnoses for arrhythmias, myocardial infarction (heart attack), and heart failure are all made using the 3-channel ECG machine. The three leads are simultaneously recorded by this machine, enabling a more in-depth examination of the electrical activity of the heart.