A screw at the shank end will secure the tip in place.

One end is used to fix the probe, and the other end is a coaxial or triaxial interface to connect the test equipment. Screw type locking shielding probe rod is suitable for measuring weak current, and can be connected to high voltage at the same time. The leakage current is less than 100fA (need to cooperate with shielding box), and the high voltage can withstand 1000V.