Abstract: The proposed velocity-measuring device (1) can measure the velocity of a wide range of objects via simple sound waves utilising the Doppler-effect principle. The velocity-measuring device (1) consists of a base unit (10) with a command-display unit (17). The base unit (10) holds a sound wave emitter with no less than one loudspeaker (8), a sound wave receiver with no less than one microphone (9), a computing unit and a display screen. In order to measure velocities the device (1) shall be placed next to the projected object line of movement in such a way that the sound waves and the line of movement meet at an acute or obtuse angle. The sound waves striking the followed object shall be partially reflected and subsequently received by the microphone (9) of the receiver. The difference between the emitting frequency and the echo frequency shall be analysed within the computing unit, producing the object velocity. The calculated velocity shall be shown via the control-display unit (17).