Laser scanner device for imaging and/or measuring fluorescent samples, which are located on sample slides and are treated with two different fluorescent dyes, comprising: (a) a motor-driveable sample table with a receptacle for sample slides (8, 10) in a sample plane; (b) at least one laser (51, 52) and a first optical system for providing two laser beams (54, 55) of different wavelengths aligned parallel to one another and parallel to said plane; (c) a scanner device comprising a scanner head having an optical deflection element for deflecting the laser beams (54, 55) to the sample, said scanner head being movable back and forth parallel to said plane and in a direction of movement; (d) a first objective for focusing the laser beams (54, 55) on the sample in the plane; (e) a second optical system for redirecting emission beam bundles (59, 60) to detectors (61, 61'), which beams are triggered by the laser beams (54, 55) on the sample and deflected by the first objective and the deflection element in a direction essentially parallel to the plane, and (f) two detectors (61, 61') for detecting the emission beam bundles (59, 60) of different wavelengths coming from the samples, characterized in that the scanner device comprises a drive and a counter-oscillator, wherein the scanner head and the counter-oscillator are connected by means of connecting rods (70, 70') to the drive and are displaceably fastened in each case to a linear guide, wherein the drive is designed to bring the scanner head into a fast reciprocating motion in the direction of movement, which simultaneously defines a scanning axis, wherein the counter-oscillator, for the purpose of impulse compensation by means of a movement in an opposite direction to the scanner head, has a mass at least equivalent to the mass of the scanner head, and wherein the optical deflection element is configured as a dichroic mirror, prism, pentaprism, pentamirror arrangement or a combination thereof, and that the scanner head defines a grid plane with its optical deflection element and its direction of movement, wherein the scanner head has a scale which is arranged at a distance from a linear measurement system of the laser scanner device and in said grid plane. (a) a motor-driveable sample table with a receptacle for sample slides (8, 10) in a sample plane; (b) at least one laser (51, 52) and a first optical system for providing two laser beams (54, 55) of different wavelengths aligned parallel to one another and parallel to said plane; (c) a scanner device comprising a scanner head having an optical deflection element for deflecting the laser beams (54, 55) to the sample, said scanner head being movable back and forth parallel to said plane and in a direction of movement; (d) a first objective for focusing the laser beams (54, 55) on the sample in the plane; (e) a second optical system for redirecting emission beam bundles (59, 60) to detectors (61, 61'), which beams are triggered by the laser beams (54, 55) on the sample and deflected by the first objective and the deflection element in a direction essentially parallel to the plane, and (f) two detectors (61, 61') for detecting the emission beam bundles (59, 60) of different wavelengths coming from the samples,