Beckman Instruments Bridge ZM-30/U Resistance Bridge Military Communications

Military Grade Resistance Bridge ZM-4B/U Murray Varley Loop AirForce Quality

Vintage US Military Bridge ZM-30/U Impedance LCR Test Set (1950s/60s)

Taffet Electronics ZM-4B/U Earth Ground Resistance Meter Bridge

Gray Instrument Co. ZM-4B/U Resistance Bridge

Unknown test equipment Untested

Digital Counter Type TSA6636 Nixie Tube

NICE Vintage BECKMAN Industrial Circuitmate DM25XL Digital Multimeter DM25