Assertion: compound microscope | /r/CapableOf | place ruler
Facets:
value: in direct contact with the specimen
type: OTHER
Source sentences:
text: This basic principle is applicable to the measurement of specimens observed in the microscope, but in practice, it is often not possible with a compound microscope to place a ruler in direct contact with the specimen (although this is often done in low-magnification stereomicroscopy).