A hand-held power tool has an electric drive motor having a drive shaft and a tool connected to the drive shaft and rotatably driven by the drive shaft. The first row is disposed downstream of the second row with respect to a flow direction of an external fluid. The base portion has a bottom wall and a frusto-conical sidewall that is sealed to the bottom wall. A block and a protruding portion are defined where the lock block moves away from the stop portion by an external force displacing the extruding portion. The digital sample values may be analyzed in a digital processor to further confirm the validity of the returned LIDAR pulse, to determine a time of arrival of the LIDAR pulse, and to calculate a distance to the target object.