A compact catoptric imaging device for drill measuring comprising: - laser guiding means suitable for guiding a laser beam, - an imaging unit arranged above the laser guiding means comprising an imaging element configured to photoelectrically convert an optical image into image information, and image processing means configured to obtain at least one drill measure from the image information, - a catoptric assembly arranged below the laser guiding means comprising a first conical surface, and a second surface comprising a frustoconical surface, wherein both surfaces (3, 4) are coaxially aligned with respect to a measuring axis, - wherein the first surface is arranged relative to the laser guiding means to reflect a cone beam onto an annular cross section of the drill to be measured, - wherein the smallest diameter of the frustoconical surface is larger than the largest diameter of the first surface to receive the cone beam reflections and reflect said cone beam reflections towards the imaging unit, - wherein the imaging unit is aligned with the laser guiding means, and with the first and second surfaces (3, 4) of the catoptric assembly, - wherein the imaging unit is arranged to receive an optical image from the frustoconical surface reflections for generating the drill image information and finally obtaining the at least one drill measure, - wherein the laser guiding means comprises an optical fiber for guiding the laser beam, and a probe for enclosing the optical fiber, and wherein the probe longitudinal axis matches the measuring axis, - and wherein the first conical surface is fitted at one end of the probe, and wherein said end is made of translucent material for allowing the cone beam to pass. - laser guiding means suitable for guiding a laser beam, - an imaging unit arranged above the laser guiding means comprising an imaging element configured to photoelectrically convert an optical image into image information, and image processing means configured to obtain at least one drill measure from the image information, - a catoptric assembly arranged below the laser guiding means comprising a first conical surface, and a second surface comprising a frustoconical surface, wherein both surfaces (3, 4) are coaxially aligned with respect to a measuring axis, - wherein the first surface is arranged relative to the laser guiding means to reflect a cone beam onto an annular cross section of the drill to be measured, - wherein the smallest diameter of the frustoconical surface is larger than the largest diameter of the first surface to receive the cone beam reflections and reflect said cone beam reflections towards the imaging unit, - wherein the imaging unit is aligned with the laser guiding means, and with the first and second surfaces (3, 4) of the catoptric assembly, - wherein the imaging unit is arranged to receive an optical image from the frustoconical surface reflections for generating the drill image information and finally obtaining the at least one drill measure, - wherein the laser guiding means comprises an optical fiber for guiding the laser beam, and a probe for enclosing the optical fiber, and wherein the probe longitudinal axis matches the measuring axis, - and wherein the first conical surface is fitted at one end of the probe, and wherein said end is made of translucent material for allowing the cone beam to pass.