Over time, design evolution and electronic developments paved the way for alternatives to the TP2 probe body. In addition, for some customers, purchasing up to eight probe bodies proved prohibitive. New probe body designs were developed, which allowed for removal and attachment of new stylus adapters. These took the place of the quick-connect joints. Individual stylus assemblies could then be removed and re-attached repeatedly and inexpensively.
Two of the better-known probe bodies of this design from Renishaw include the TP20 and the TP200. The TP20 uses a magnetic coupling, which allows the exchange of multiple probe modules. You can store the individual modules in the TP20 probe rack, which is actually called the MCR20 (where "MCR" is Module Change Rack).
Each probe body is roughly equivalent to the TP2 in size and shape, but there are two main differences:
Due to their enhanced electronics, they can hold more weight and still produce more accurate and repeatable results.
They are designed with a magnetic "split" between the upper probe body and the lower stylus holder. This allows them to be used with their own stylus change rack systems: the MCR20 and the SCR200, respectively.