TREK 541P-S 探头微型静电场斩波器，适用于541A型

Probe Miniature electrostatic field chopper 
Side-view orientation
(square body)
Model 541P-S. Aperture 2.5 mm (0.1”)
diameter. Dimensions 5.6 mm sq x 50 mm L
(0.22” sq x 2” L)