A system and method for visually indicating information regarding a hardware device component of a measurement system. The invention also relates to a device for processing the data representative of the corresponding depth. The system preferably comprises six sub-circuits: DC power path circuit, shadow-ring detector circuit, isolation circuit, DTMF receiver circuit, DTMF generator circuit, and micro controller circuit. The mounting base may be removably affixed to a structure such as a wall or ceiling. Preferably, the link occupancy data is classified into quality of service classes.