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Twin instrument comprising moving coil ammeter and moving coil voltmeter with a range-change switch

Twin instrument comprising moving coil ammeter and moving coil voltmeter with a range-change switch

Portable moving-coil 3-inch recording voltmeter/ammeter type GR303/11 serial no. K9385/A1, by Record, speeds 1 inch and 6 inches per hour, ranges 75mV, 150mV, 9mA and 10mA

Portable moving-coil 3-inch recording voltmeter/ammeter

1960-1979