The coil of our Rogowski Coil Power Meter (Flexible Clamp Meter) is designed to be opened and closed like a lid of a pen, simply pull to or push from the notch to disconnect or connect it, making it incredibly easy to operate. It is designed to measure AC Current, Voltage, Frequency, Phase Angle, and Power. It is widely used across many industries, it is especially suitable for testing densely packed wires, transformers ground core current, thick wire cable current testing; power testing of motors and transformers, thyristor-controlled rectifier, semiconductor switches, power electronic conversion equipment, or current in industrial environments with severe signal distortion such as arc welding.