Vtg THOMAS SERFASS CONDUCTANCE BRIDGE RCM15 ELECTRICAL TOOL TESTER RESISTANCE/CONDUCTANCE.  UNTESTED

Descruiption found on line: The tuning controls on the Serfass conductivity bridge consist of three mechanical knobs. A multiplier knob sets the range of the instrument, and the dial control knob controls the tuning by means of a large mechanical disc below the eye tube. A sensitivity control is also provided to make measuring an unknown component easier, by altering how close the device must be tuned to the actual value of the test component before the eye tube begins to react. This unit can measure both resistance and conductance: values on the left side of the multiplier knob are for resistance, and the right side values indicate conductance.The RCM 15B1 has only four electron tubes: one each of 6AU6, 6AQ5, 6X4, and the 6E5 eye tube.Serfass RCM 15B1 conductivity bridge. A date at the bottom of the instruction card indicates that this device was most likely manufactured in 1958.Serfass RCM 15B1 conductivity bridge. A date at the bottom of the instruction card indicates that this device was most likely manufactured in 1958.

selling as pictured.

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