The mirrored scale makes it easier to read the instrument to a given accuracy by enabling the operator to avoid parallax errors.
All hardware is nickel-plated brass.
The front panel and meter face plate are of heavy cast iron with a fine diamond pattern on the casting. The binding posts are of black Bakelite. The meter has a mirrored scale. The serial number is hand written on the white scale behind the face plate. There is a calibration sheet held under acetate in a black painted brass frame inside the door.