Vintage industrial Motorola AC voltmeter with case

Vintage industrial electrical or electronics AC volt meter made by Motorola. This meter is marked "A.C. Voltmeter" and is rated for "R.M.S. Volts", "Decibels" and "1 MW 600 Ohm". This is a powered meter, made to plug into regular household electricity. This is from the estate of an industrial communications engineer and ham radio enthusiast.

There is wear and soil to the case. The plug has bare wire exposed at the base of the electrical plug and we haven't tested it.