Electricity Usage Monitor, Power Meter, Reduce Your Energy Costs Electric Meter measures energy consumption in kWh (units of electricity) and its cost. Simply plug this device to your wall electric outlet and plug your appliance to it Multipline display for simultaneous reading power and cost. Much advanced features Max Load: 15A 1800W. Displays volt, amp, watt, kWh / unit of electricity, time, cost and kg of Co2 Larger LED display for easy reading! Measuring Range: 1-1800W. Working Temperature: 23F to 122F.