Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by profession or discipline]
7. [equipment for science and technology]
8. optical instruments
9. microscopes
10. electron microscopes

Anotations

Scope note:

Electron microscopes designed for directly studying the surfaces of solid objects, utilizing a beam of focused electrons of relatively low energy as an electron probe that is scanned in a regular manner over the specimen. An electrical signal is obtained by collecting and amplifying secondary electrons emitted by the specimen and is applied to a cathode-ray tube scanned in synchronism with the electron beam.