A new 3D-probing system is presented, whose design is not only optimized for isotropic stiffnesses at the probing element but also for most effective manufacturing and easy assembling. A deflection of the probing element results in a change in the position and/or orientation of a moveable plate in which the probing stylus is screwed. The motions of the moveable plate are measured by capacitive sensors. The geometry of the probing system is designed using a procedure based on the Finite Element Method (FEM) and is veryfied by force measurements. Therewith the stiffnesses at the probing element can be determined using FEM simulations and adapted to given specifications before realizing the probing system. By means of this verified design tool it is possible to adjust the properties of the probing system like its stiffnesses to different measuring tasks and applications, e. g. as probing system for (micro-) coordinate measuring machines or machine tools. The geometric checking of the probing system includes the determination of the linearity error in probing direction, the maximum permissible probing error, the repeatability, and the environmental variation error.