Disclosed is a display apparatus which is used so as to produce a hardware remote controller capable of operating a plurality of instruments. Many simultaneous data points are gathered by sensors monitoring a service, which then send the raw data to a collection of analyzers running in one or more centralized data centers for examination. Inside the housing and adjacent to the chuck, a signal preamplifier is arranged whose signal port facing the chuck is electrically connected with the support surface, wherein the signal preamplifier is moveable together with the chuck by the positioning device in a way that it holds its position constant relative to the chuck during positioning.