Clamp meters are convenient measuring instruments that can measure current simply by clamping a wire while being energized without cutting a circuit. They are also known as amp clamps, clamp-on amp meters, or amp probes. Clamp meters have most of the basic functions of a Digital Multimeter (DMM), but with the added feature of a current transformer built into the product. Some clamp meters also include advanced features such as a non-contact voltage detector, single and dual thermocouple thermometers, and a built-in IR thermometer.

Both Digital and analog clamp meters are designed to measure AC , DC, or both AC and DC currents.

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