Two connector components, such as MT ferrules are secured in a three part holding device for testing purposes. Deposition of byproducts on the inner wall of the vacuum chamber can be suppressed by grounding the connection point of the inductive coupling antenna and the electrostatic capacitive coupling antenna via a variable-impedance load and varying an impedance of the variable-impedance load, thereby controlling a ratio of plasma produced in the chamber by electrostatic capacitive coupling discharge. The disclosed compositions are useful, for example, in the diagnosis, prevention andor treatment of diseases, particularly prostate cancer. The tool holder includes a center rod, a tool interface and a quick connect mechanism. There may be a removable covering for the face opening and an eye covering.