A measurement device is provided. A sensor senses a vessel pulse waveform of a specific region of an object to generate a vessel pulse signal in a measurement mode. In the measurement mode, a first electrode generates a first potential signal, and the second electrode generates a second potential signal. A first analog front-end circuit digitizes the vessel pulse signal to generate a digital vessel pulse signal in the measurement mode. In the measurement mode, a second analog front-end circuit obtains an electrocardiogram signal according to the first and second potential signals and digitizes the electrocardiogram signal. A memory stores the digital vessel pulse signal and the electrocardiogram signal. A processor determines a polarity of the electrocardiogram signal in the measurement mode to indicate that the specific region is on a left or right part of a body of the object.
