The term 'Usage Measuring Device' can be summarized as a device used to measure usage, and the crossword solution for this term is 'METER' (5 letters). A METER is a device used to measure the amount of something, such as electricity, gas, or water. It is typically used by utility companies to measure the amount of energy or water used by a customer. Meters are also used in scientific research to measure various physical properties, such as temperature, pressure, and speed.