Assertion: vacuum tube voltmeter | /r/HasProperty | popular instruments
Facets:
value: for measurement
type: PURPOSE
value: very
type: DEGREE
value: for electronic test
type: PURPOSE
Source sentences:
text: Such vacuum-tube voltmeters, or (VTVMs) were once very popular instruments for electronic test and measurement.
text: Such vacuum-tube voltmeters, or (VTVM's) were once very popular instruments for electronic test and measurement.