Wiktionary
q meter
n. an instrument used to measure the Q factor of an electric circuit at radio frequencies
Wikipedia
Q meter
A Q meter is a piece of equipment used in the testing of radio frequency circuits. It has been largely replaced in professional laboratories by other types of impedance measuring device, though it is still in use among radio amateurs. It was developed at Boonton Radio Corporation in Boonton, New Jersey in 1934 by William D. Loughlin.
Usage examples of "q meter".
The second angler, Art Pinkler, was witty, knowledgeable, and ruggedly handsome, but burdened with a squeaky New England accent that spelled death on the Q meter.