Power meters measure the power consumption of a device. In addition to the active power consumption the power meters can determine the capacitive reactive power, apparent power, measure voltage and current and can calculate the power factor. This is not only important for energy cost analyses, it is also important for security aspects in the field of electricity, too. Power meters can also measure the electricity network pollution which can result in overvoltage and overcurrent with the risk of destroying devices in the power network. Usage The power meter will be installed in the main power line. All parameters will be measured and displayed in several ways.