Hand-held device comprising sensor unit, for characterizing a treated substrate

Drilling machine for manually actuating by a user, wherein the drilling machine comprises:

• a drilling unit which is configured for drilling a drilling hole in an underground;
• a sensor unit which is configured for detecting sensor data which are indicative for a condition of the underground, before, during, and/or after processing the underground;
• a determination unit which is configured for determining an information which is indicative for the condition of the underground, based on the sensor data, wherein the determination unit is configured to select a dowel based on the determined information which is indicative for the condition of the underground;
• and
• a user interface for outputting the selected dowel for the underground.