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The HOBO MAG-0400 Series AC Current Transformers are mounted around a current carrying wire to measure AC amperage. These CTs provide a 0 to 0.333 Volt AC output proportional to current flow and is used with Onset loggers via the FlexSmart TRMS module and with kWh transducers (WattNodes) for True RMS measurement of sinusoidal and non-sinusoidal waveforms. The result is an accurate current measurement for many types of electrical equipment.