A process for measuring a point comprising at least one spectrometer and a measuring transducer connected thereto for picking up, processing and forwarding measuring signals from the spectrometer, the spectrometer being arranged in an armature for introduction into a process or a process fluid and the data produced by the spectrometer is used to control a process. The faint interference conventionally observed can be reduced by irradiating the semiconductor film with a laser beam by the use of an optical system using a mirror of the present invention. The controller may be configured to receive information regarding a predetermined task for the machine, receive the machine’s position, and receive a location of an obstacle at the excavation site. During account creation, the system presents to the user the subset of questions, and receives and stores a response from the user.