Xseries&trade; TS-836 Plug Power Meter Energy Watt Voltage Amps Meter with Electricity Usage Monitor, Reduce Your Energy Costs Measures various parameters: power (W), energy (kWh), volts, amps, hertz and so on. Large, clear LCD display for easy reading Electricity price setting: pressing COST, FUNCTION, UP and DOWN button according to the instructions Built-in Battery backup - allows meter to be moved (and viewed) without losing readings Displays volts, amps and wattage accurate to 3%