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Notify me when its in stockPZEM-020 10A AC Digital Power Monitor, 10A AC Digital Display Power Meter Meter Voltmeter Ammeter Frequency Factor Meter is a monitoring system for parameters such as voltage, current, active power, energy, frequency, power factor, etc. The display comes with a high-quality current sensor, which you can easily measure the current passing through the wire using the non-contact method, which means there is no physical contact between the wire and the meter.