This is not a working meter. As a vintage object it may appeal to the cinema enthusiast drawn to the beauty of its design. As it has never been used, it is flawless and comes in its original packaging! The issue with it is that the meter runs on selenium cells which are no longer able to hold a charge.
As you can see, this Gossen Sixtomat x3 light meter has an accordion cover. It measures 3 inches long, approximately 2-1/4 in. wide, and 1-1/4 inches thick. It features a dial on the side for the ASA or DIN of the film (film speed). It has an accordion cover for the meter's sensing as well as display area. There is a color finder on the back. The Sixtomat x3, was manufactured by Gossen Germany, and was a universal exposure meter for photographers.
The Sixtomat X3 is the last meter in a line of Sixtomat meters developed and sold in a period of aprox. 20 years. The first meter the Sixtomat was developed in the late 40's and lasted after several modifications until the seventies.
On march 25th 1954 P.Gossen GMBH filed a patent for their invention of the 'aparatus for determining the color temperature of a source of light' under number USA patents 2,886,712. The inventors listed are Werner Schulze and Hans Gossen. This was the color finder, the last addition to the Sixtomat. The device was patented may 12 1959.