This invention relates to porous paper machine clothing for dewatering a paper web in a paper machine, comprising a filament lay-up made of at least one layer of longitudinal filaments and at least one layer of transverse filaments which cross the longitudinal filaments, wherein the longitudinal and transverse filaments are adhesively bonded to each other via an adhesive at crossing points. In certain embodiments, the cation is labeled with one or more radioisotopes. The shape variation on devices is converted to variations in device parameters.