Army Signal Corps Frequency METER (BC 221 N)

Frequency meter, 12-1/2 x 10 x 9-1/4", in black wrinkle-finished aluminum alloy cabinet w/ carrying handle & "D" rings for strap (not included). Comes w/ Calibration Book (MC-177-N). Frequency meter is principal component of Frequency Meter Set (SCR-211-*), a precision instrument designed to measure or radiate radio frequency impulses.