volt box
noun
: a resistance box provided with taps, usually used with a potentiometer for measuring potentials beyond the range of that instrument, and so constructed that by means of the taps a definite fraction (as ¹/₁₀ or ¹/₁₀₀) of the potential applied to the volt box is made available for potentiometer measurement
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Merriam-Webster unabridged
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