An early analogue ac voltmeter produced by the Weston Electrical Instrument Company and used by personnel based in Bldg. 409 at CRNL. The instrument, packaged in a Bakelite box, is approximately 13 cm square by 8.5 cm deep. Input is at three possible points for full-scale range of 150 V, 300 V or 750 V. Accuracy claimed to be 0.75%.
