An on-chip timing measurement circuit for improving skew measurement and timing parameter characterization in integrated logic circuits providing increased accuracy and range. Further optionally, external pressure may be applied on the segment to assist in complete collapse. The rotor segment also has the same sectional shape as a screw and a kneading disk, which are assembled in other screw segment and kneading disk segment of the screw set, except for crest portions of the kneading blades. A mounting assembly is configured for mounting on a supporting wall structure, with the housing being releasably attachable to the mounting assembly.