A power monitoring system, comprising: a current transformer comprising: a winding configured to sense a measure of current in a conductor that supplies power to a load; a machine-readable apparatus, the machine-readable apparatus configured to encode calibration information specific to the current transformer; a Near-Field Communication device operatively coupled to the machine-readable apparatus; a mobile device comprising an application running on the mobile device, the mobile device configured to read the calibration information specific to the current transformer from the machine-readable apparatus via the NFC device of the current transformer; and a power meter comprising: a first input configured to receive the measure of current in the conductor from the current transformer; a second input configured to receive a measure of voltage of the conductor; a wireless receiver; a controller operatively coupled to the first input, the second input and the wireless receiver, the controller configured to: receive the calibration information encoded in the machine-readable apparatus from the mobile device via the wireless receiver; calibrate the power meter for use with the current transformer based on the calibration information from the mobile device; and determine a number of power monitor parameters based at least in part on the measure of current sensed in the conductor by the current transformer and the measure of voltage of the conductor once the power meter has been calibrated for use with the current transformer. a current transformer comprising: a winding configured to sense a measure of current in a conductor that supplies power to a load; a machine-readable apparatus, the machine-readable apparatus configured to encode calibration information specific to the current transformer; a Near-Field Communication device operatively coupled to the machine-readable apparatus; a winding configured to sense a measure of current in a conductor that supplies power to a load; a machine-readable apparatus, the machine-readable apparatus configured to encode calibration information specific to the current transformer; a Near-Field Communication device operatively coupled to the machine-readable apparatus; a mobile device comprising an application running on the mobile device, the mobile device configured to read the calibration information specific to the current transformer from the machine-readable apparatus via the NFC device of the current transformer; and a power meter comprising: a first input configured to receive the measure of current in the conductor from the current transformer; a second input configured to receive a measure of voltage of the conductor; a wireless receiver; a controller operatively coupled to the first input, the second input and the wireless receiver, the controller configured to: receive the calibration information encoded in the machine-readable apparatus from the mobile device via the wireless receiver; calibrate the power meter for use with the current transformer based on the calibration information from the mobile device; and determine a number of power monitor parameters based at least in part on the measure of current sensed in the conductor by the current transformer and the measure of voltage of the conductor once the power meter has been calibrated for use with the current transformer. a first input configured to receive the measure of current in the conductor from the current transformer; a second input configured to receive a measure of voltage of the conductor; a wireless receiver; a controller operatively coupled to the first input, the second input and the wireless receiver, the controller configured to: receive the calibration information encoded in the machine-readable apparatus from the mobile device via the wireless receiver; calibrate the power meter for use with the current transformer based on the calibration information from the mobile device; and determine a number of power monitor parameters based at least in part on the measure of current sensed in the conductor by the current transformer and the measure of voltage of the conductor once the power meter has been calibrated for use with the current transformer. receive the calibration information encoded in the machine-readable apparatus from the mobile device via the wireless receiver; calibrate the power meter for use with the current transformer based on the calibration information from the mobile device; and determine a number of power monitor parameters based at least in part on the measure of current sensed in the conductor by the current transformer and the measure of voltage of the conductor once the power meter has been calibrated for use with the current transformer.