The sound attenuation and velocity of any fluid like material, such as water, toothpaste, sauce, etc. is able to be measured with this DT-100. No prior sample information is required and a variable gap technique eliminates any need for calibration for this instrument. The pulse technique which adjusts the accumulated number of pulses automatically also can produce an extremely large dynamic range that is useful and needed to characterize samples over a huge range of particle size and concentrations.