Example sealed electronics modules are described. In the present invention, in order to accomplish the above-described object, there are provided a method and a device for determining the position for detection of charged particles by making the comparison between a stained optical microscope image and an elemental mapping image formed based on X-rays detected by irradiation with the charged-particle beam. A differential amplifier output includes an amplitude proportional to a difference between the first differential input and the second differential input. The presser member has second protrusions in positions corresponding to the first protrusions of the holder body, and covers the optical fiber accommodating unit.