Check the listing for details. Vintage Weston Electrical 120V A.C. Voltmeter Wood Box Instrument Model 155. Condition: Used, Made in United States. Listed at 100.00 USD. The Vintage Weston Electrical 120V A.C. Voltmeter is a high-quality instrument housed in a classic wood box. Manufactured by Weston Electrical Instruments in the United States, this analog voltmeter accurately measures AC voltage from 0 to 120V with a frequency range of 60hz. Perfect for testing and measurement in various industrial and commercial settings, this vintage device offers reliable performance and durability for precise voltage readings.