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Röhrenvoltmeter n
el.	valve voltmeter
meas.inst.	vacuum tube voltmeter; VTVM; electron tube voltmeter; electronic voltmeter
phys.	thermionic voltmeter; vacuum-tube voltmeter
tech.	grid leak voltmeter
tech., el.	tube voltmeter

Röhrenvoltmeter: 10 phrases in 3 subjects

Automated equipment	1
Electronics	5
Measuring instruments	4