Clamp meters are highly efficient at safely and speedily measuring current, without interrupting the current flow or using test leads. The clamps measure current such as AC current, AC and DC voltage, resistance, and continuity. Some models can also measure DC current, capacitance, temperature, and frequency.Clamp meters are electrical test instruments utilised for measuring current without connection to a circuit in series. They can easily be used and operated to measure live conductors without causing damage or loss of power. In short, they are devices used for safe and convenient current measurement.