The Cosense Model ML-101, Single as well as Multichannel Ultrasonic Measurement System uses very small sensor (VSS) technology to fit into those applications where ultrasonic sensors could not previously be used. The smaller size of the sensor enables the ML-101, to be used with autosamplers, robotic samplers, titration equipment, microsampling devices and test tube racks. The ML-101, performs high speed, multipoint, non-contact ultrasonic measurements with an accuracy of +/- 0.005" (0.1mm). The ML-101 is based on a modular design which accommodates from 1 to 24 transducers per unit. The ML-101 is fully programmable through its serial port. A choice of 4- 20mA, 0-10 volt DC or RS-232 outputs are available. Ultrasound has a number of advantages over other systems available. Measurements are not affected by liquid color or lack of color, there is no physical contact with the liquid so no disturbance of the sample occurs.