Abstract: An adjustment and test device for a laser ranging system or laser range finder which device is adapted for obtaining the parallel alignment of optical axes of the transmitter and receiver with respect to one another and with respect to the optical reference axis, characterized by a test unit, an optical adapter unit and a mechanical adapter unit. The test unit has a housing, a collimator, which comprises a collimator lens, a beam splitting cube with a reticule, a device for illuminating the reticule and a device for observing the illuminated reticule, and an arrangement for mounting the collimator in said housing for adjustment of the optical axis of the collimator in the housing. The optical adapter unit has an independent housing and has an arrangement for optically coupling the test unit to the laser ranging system which includes at least one movable optical coupling element for interconnecting an optical axis of the laser ranging system to the collimator axis.