electrometer tube
noun
1
: an amplifier tube of extremely high sensitivity used in a vacuum-tube measuring instrument (such as a voltmeter)
2
: a vacuum tube having high impedance in the grid circuit so as to minimize the undesirable control-grid current
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“Electrometer tube.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/electrometer%20tube. Accessed 22 Nov. 2024.
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