With Panasonic KW9M Eco-Power Meter, electrical power (voltage, current, etc.), power factor, frequency, etc are measured using AC voltage and AC current input via one of the following systems: single phase two-wire system, single-phase three-wire system, three-phase three-wire system or three phase four-wire system. This has built-in thermistor to measure the temperature of installation place such as inside the panel board for your reference. Capable of displaying small currents of 1 mA or above. This allows for the monitoring of standby power consumption, which helps energy saving. Large-screen LCD with backlight clearly displays the electric power of each phases and their total on one screen. Capable of displaying small currents of 1 mA or above. This allows for the monitoring of standby power consumption, which helps energy saving. Capable of simultaneously measuring up to three circuits in a single phase two-wire system of same power supply. Data can be made visualization by connecting the meter to DLL and logging the data. You can measure power with a direct connection to an already-installed large-capacity general-purpose CT (secondary side 1 A / 5 A type).