Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Measuring Devices (hierarchy name)
5. measuring devices (instruments)
6. [measuring devices for extent]
7. distance measuring devices
8. angle measuring devices
9. horizontal angle measuring devices
10. compasses (direction indicators)

Additional parents:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment
4. Tools and Equipment
5. equipment
6. equipment by profession or discipline
7. equipment for engineering and building trades
8. surveying instruments

Anotations

Scope note:

Compasses for measuring horizontal angles during surveying with reference to the direction of a magnetic needle; usually capable of fastening to tripods or other firm supports and equipped with sighting apparatus.