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A complete measuring system consists of a coil and an integrator. We have a range of integrators to suit different requirements. They differ in the way they are powered (mains, battery, own power supply) and in the type of output (voltage waveform, current waveform, RMS, 4-20mA DC output). Some of the integrators have several sensitivities which are selected by a switch. Click here for a summary of integrator types. More information about integrators. A coil + integrator system cannot measure direct currents although it is possible to measure very low frequencies. For more information about low-frequency performance see Dealing with Droop.