A touch probe for conducting ultrasonic medical investigations has a housing (1) which accommodates a sound transducer unit (10) via a coupling liquid (7) is adapted to an object to be examined can be coupled for scanning a surface region in a plane defined by their emission scanning plane and for the purpose of scanning a Volumsbereiches the examination object also has an a motor (11) back with gear (12) having drive unit and is reciprocally pivotally driven, whereby the position of each point in the scanned volume area by its location in the scan and the detected instantaneous pivot position of the transducer unit ( is 10). To simplify the construction and control of the motor (11) of the drive unit is designed as a step motor and each instantaneous pivot position of the transducer unit (10) through the control signals for this step motor defines derived signals on at least one sensor (14, 15) in a predetermined pivotal position, in particular the neutral central position, the transducer unit synchronizing signals generated are based. The transducer unit immersed at least emission and reception side directly into the housing (1) to a sound-permeable outer casing (2) filling coupling fluid (7).
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