Use the meter to monitor and measure the energy usage of any 13 amp rated electrical appliance. Plug the meter in to a powered mains socket and then plug the appliance you want to monitor into it. It also calculates the cost of electricity used and assesses the carbon footprint. Voltage Rating: 240V ac 50Hz. Current rating: 13A. Maximum load: 3120W. Power Consumption: 0.5W. Metering: Voltage 200 to 276V AC,. +/-1.5%. Frequency range 45 to 65Hz. Current range 0.005 to 13A, +/-2%. Power range 0.1 to 3120W, +/-2%. Power Factor: 0.00 to 1.00. Overload power setting and alarm. Accumulative electricity usage range.