The Extech PM120 is a portable electrical power meter that enables users to monitor and analyze power consumption of home and office appliances. It features large dual LCD displays showing voltage, current, power, power factor, and frequency, along with total time, energy cost, and set parameters. Equipped with a North American Type B 3-prong plug, side socket, and CR2032 backup battery, it offers real-time metering, over-current warnings, and customizable cost inputs for precise energy management. This device simplifies energy efficiency analysis, aiding in cost reduction and device replacement decisions.