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Two ultrasonic transducers were installed through cutout holes on opposite walls of a chamber. The materials under investigation (samples) were put between the transducers inside a sensing zone in three different elevations. Results of the experiment indicated that there were relationships between acoustical energy and mass of the material. This suggests that, within a limit, mass can be measured acoustically. The amount of acoustical energy attenuation is dependent on the position of the sample in the sensing zone. The accuracy of measurements can be improved if the variation in the position of the sample in the chamber can be minimized.