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ECG clamps are often made of high-quality plastic and come in a variety of colors. The metal parts of the clamp are usually nickel-coated for better conductivity. Some ECG clamps can be attached to the wrists or ankles, while others can be used with a general ECG in point machine. An ECG clamp is a set of four reusable electrodes that are used to hold an electrode to the chest wall during an electrocardiogram (ECG). The electrodes are small, plastic patches that stick to the skin and are connected to an ECG machine by lead wires. The machine measures the heart's electrical activity, interprets it, and prints it out.