Abstract: A digital tape measure comprising a tape stored in a case when it is not used and drawn out of an aperture of the case when it is used and onto which a plurality of detection marks are affixed at equivalent interval, a detector of detecting the detection marks by photoelectric transfer elements, a counter of counting the detected signal being output from the detector corresponding to the volume of movement of the tape, a display of displaying the result counted by the counter, and in which a length of each detection mark is established to be a length twice as long as the minimum scale of the tape, the distance between each detection mark is established to be equivalent to the length of each detection mark in the direction of measurement, and the detector comprises two photoelectric transfer elements arranged at the phase difference of 90.degree. and a discriminator of discriminating the output signal from the photoelectric transfer elements.

Abstract: A digital tape measure comprising a tape movable corresponding to a length of an object to be measured and on which detection marks are affixed, a detector for detecting the detection marks, a computer for computing a detection signal outputted from the detector corresponding to an amount of movement of the tape and a display for displaying a result of computation, characterized by dividing the case body into a housing for storing the tape and a housing for holding a measuring part comprising the detector, computer display, these two housings being detachably connected each other.