General Radio GR STROBOTAC Type 1531

VINTAGE GENERAL RADIO - STROBOTAC - TYPE: 1531-AB ELECTRONIC STROBOSCOPE

GENERAL RADIO TYPE 1538-A STROBOTAC

General Radio Company Strobotac Type 1531 Stroboscope Meter 105-125V 35VA

General Radio Co. Strobotac 1531-A Industrial Stroboscope – Vintage RPM Tester

General Radio 1531-AB Strobotac

*TC* GENERAL RADIO STROBOTAC TYPE 1531 (SJJ78)

Vintage General Radio Strobotac Type No. 631-B Made In USA Powers On