A control system for estimating the performance of a compressor is disclosed. Each of the weights is provided with spaced shallow grooves to show a plurality of equal sections corresponding to a specific weight thereof. A payment interface is provided for presenting a plurality of additional non-gift-card payment options comprising a credit-card payment option and a non-credit-card payment option. While the background image is displayed, the previously extracted object image is read from the storage unit. 0%, the normalized thickness being determined by normalizing the thickness of the interdigital transducers by the wavelength of the surface acoustic wave. A register is connected to the data reception terminal for receiving the data.