Gossen Sixon CF exposure meter.
The Sixon is an extremely sensitive,
accurate and versatile photoelectric exposure meter. It shows the
precise combinations of aperture and shutter speeds and in addition
permits the measurement of color temperature. The possibility of
choosing either of the two measuring methods, i.e. reflected or incident
light measurement coupled with the color temperature method, ensures
optimum results for still and cine, black-and-white and colour