Cropico (Croydon Precision Instrument Co.) Volt Ratio Box, Type VR2, manufactured in England. A precision laboratory instrument used to provide accurate, selectable voltage division ratios for calibration and comparison work, typically in conjunction with a potentiometer or standard reference source. Marked with multipliers (×10 to ×400) corresponding to stepped voltage outputs from 15 V to 600 V. Used in metrology laboratories, calibration departments and research facilities, mid-20th century, circa 1950s–1970s.
W32 x D15 x H22 cm.
Untested.
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