G.P.O. (General Post Office) universal multimeter, England. A portable analogue electrical testing instrument designed for measuring resistance, A.C. and D.C. voltage, and current in telecommunications and electrical circuits. Marked with high sensitivity ratings (20,000 ohms per volt D.C., 1,000 ohms per volt A.C.), indicating a precision instrument used by Post Office engineers for servicing telephone exchanges and communication equipment. Mid-20th century telecommunications test equipment, c.1950s–1960s.
W9.5 x D4.5 x H15 cm.
Untested.
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