In a device for optically scanning and measuring an environment, where the device is a laser scanner having a light emitter which, by a rotary mirror, emits an emission light beam, with a light receiver which receives a reception light beam, which, after passing the rotary mirror and a receiver lens which has an optical axis, is reflected from an object in the environment of the laser scanner. In order to prevent damage to the loaded goods by water dripping from the roof edge, an adjustable gutter underneath the roof edge is proposed. At least one signal tapped by a second data line or an external signal is used as a reference signal for the adaptive filter, and the corrected signal transmitted on the first data line is used as an error signal for the adaptive filter. The state of the programmed signal can be used to replace a primary circuit element of an integrated circuit with a redundant circuit element. Additionally, a cooling stem may be positioned with the inlet chamber to increase the heat exchange surface area exposed to the cooling medium. The system is configured for retrieving, in response to a user query, relevant data items by using the meta-data selectively.