Our distance-measuring systems are used the world over, generally as mobile systems on rail or road vehicles, and, more recently, also on unmanned aerial vehicles (UAVs). Some of these units are exposed to a high level of stress. Our geometrical measuring systems measure precisely and reliably despite extreme temperatures, moisture, vibration or changing light conditions. This requires robust systems engineering. We use special materials on the one hand, and the systems also have rugged housings, a fully automatic cleaning system and various safety facilities on the other in order to guarantee this.