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4 inch in diameter disc.
A 2-sided disc with a gray side and a white side, to handle your needs of color balance and proper exposure alike. You use the white side for color balancing, and after the white balance is achieved you use the gray card for an accurate exposure reading.
Gossen Cds light meter. Takes a PX13/PX625 cell.
A rare and unusual light meter.
A rather nice little Selenium light meter.