Device for non-contact measurement, comprising: a light source, a light pattern projector, an imaging system configured for imaging a target site illuminated by the light pattern projector, a support to which the light pattern projector and the imaging system are attached in fixed relative positions, and a processing unit configured to process data acquired by the imaging system, wherein the support has a longitudinal axis parallel to an optical axis of the light pattern projector, wherein the light pattern projector and the imaging system are arranged at spaced apart positions along the longitudinal axis, characterised in that: the light pattern projector comprises a diffractive optical element optically coupled to the light source, in that the light source is operable to emit a plurality of light beams of different colours, each one of the plurality of light beams being a coherent beam and being optically coupled to the diffractive optical element, such that the diffractive optical element is configured to diffract the plurality of light beams according to different diffraction angles resulting in separate patterns (201, 202, 203), in that the processing unit is configured to control the light source and/or the light pattern projector such that a single one of the separate patterns is projected at an instant of time, and/or in that the device comprises a user interface configured to select a single one of the separate patterns for projection, and in that the processing unit is configured to determine a measurement based on at least two positions automatically recognised in data acquired from a single one of the separate patterns. a light source, a light pattern projector, an imaging system configured for imaging a target site illuminated by the light pattern projector, a support to which the light pattern projector and the imaging system are attached in fixed relative positions, and a processing unit configured to process data acquired by the imaging system, wherein the support has a longitudinal axis parallel to an optical axis of the light pattern projector, wherein the light pattern projector and the imaging system are arranged at spaced apart positions along the longitudinal axis, the light pattern projector comprises a diffractive optical element optically coupled to the light source, in that the light source is operable to emit a plurality of light beams of different colours, each one of the plurality of light beams being a coherent beam and being optically coupled to the diffractive optical element, such that the diffractive optical element is configured to diffract the plurality of light beams according to different diffraction angles resulting in separate patterns (201, 202, 203), in that the processing unit is configured to control the light source and/or the light pattern projector such that a single one of the separate patterns is projected at an instant of time, and/or in that the device comprises a user interface configured to select a single one of the separate patterns for projection, and in that the processing unit is configured to determine a measurement based on at least two positions automatically recognised in data acquired from a single one of the separate patterns.