The i-meter® MF3 is a 3-element meter, compared to the i-meter® MF6 which is two 3-element meter. The i-meter® MF6 provides 1 extra 3-element meter in the same enclosure. This allows for the monitoring of Volts, Amps, KiloWatts, Power Factor, Frequency and Harmonics [V, I, kW, kVA, PF, Hz, THD (V/I)], of 2 meters in 1.