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The 1961 Gossen Lunasix (in US Luna Pro) is a hand held exposure meter. Sold for many years the Lunasix was famed for its low light sensitivity, still impressive by today's standards. It was the company's first light meter not based on a selenium light receptor. The styling, layout, and distinctive "computer" dial set the standard for successive Gossen meters until the advent of electronic displays.
The meter movement and operating mechanism are mechanical, however the CdS light cell requires battery power. Measurement is made by depressing the rocker switch in one direction for low light, and the other for daylight. When the rocker is released the needle remains clamped in place making transfer of the reading to the "computer" ring much easier.