Check the listing for details. Antique Oak Hoyt Electrical Instrument Working Voltmeter. Listed at 35.00 USD. The product is an antique oak voltmeter from the Hoyt Electrical Instrument Works, manufactured before 1930. This original piece is part of the scientific instruments collection, specifically used in the pre-1930 era for measuring electrical voltages. With its historical significance and craftsmanship, this voltmeter serves as a valuable and unique piece for collectors or those interested in antique science equipment.