With the recent push for green energy and environmental friendliness, more and more people are concerned about their personal daily power usage. We developed a microcontroller-based device to measure AC power. The user will be able to insert the device between the wall socket and the device under test (DUT) to measure the amount of AC power being used. With this device, environmentally conscious people can use the C# application that we developed to monitor their energy usage with real time graphs and data display.