Signal Corps Relay Test Set No I-181B

Missing one knob otherwise appears to be complete. Serial number 29! Manufactured by Marine View Electronics.

From the web site:

A portable current flow test set for use in testing and adjusting relays (and similar apparatus) in accordance with electrical requirements for performance of the relay. Provides for application of specified values of current thru the relay winding. May also be used as milliammeter in scale range 0-15, 0-75, 0-150ma.

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