CSI-73S (Micrometer-Electrode System )
The CSI-73S Micrometer-Electrode System was developed to eliminate leads and of the measuring capacitor at high frequencies. The specimen maybe the same size or smaller than the electrodes.

The device includes:

Micrometer Head-hard chromed
Aluminum Housing
Bellows
Grounded Adjustable Electrode-Stainless Steel
High Fixed Electrode-Stainless Steel
Vernier Head Capacitor
Ground Terminals

Reference:
ASTM D150