Wooden box with metal instrument panel on top; four small black rubber feet on bottom; front of wooden box contains printed instructions and folds down to show inside of instrument; rectangular wooden area attached to back of main box has six rectangular slots that hold rectangular slides; each slide has two vertical metal cylindrical supports that attach to a black rectangle with two circular glass pieces of different colors; metal instrument panel has two medium-sized black plastic knobs near bottom, four metal switches, a rectangular slot for slide, and a circular opening possibly for sample; metal plaque on front and at top of instrument panel identifies manufacturer; black plastic coated power cables attach to wooden box in back, just below instrument panel.

The Evelyn Photoelectric Colorimeter was introduced around 1950. It featured a single-cell, direct reading photoelectric photometer, as well as a Rubicon Spotlight galvanometer.