The F485 allows a simple testing of lengths or deepness. The switch probe has been developed for a mechanical detecting of a DUT at limited space. The movement of the plunger enable testing of the correct position of a DUT, a Pin or a borehole. The F485 can be used in standard receptacles like H885RD or H885KB. The combi-receptacle H885KB, enables a solder-less exchange of the probes.