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    Photomacrographic Scale Ruler (ABFO No. 2)

    Rigid, L-shaped piece of laminated plastic 1 mm thick
    Millimeter markings accurate to 0.1 mm or INCHES
    Overall size is 105 mm x 105 mm (about 4" x 4")
    Gray areas have a reflectance value of approximately 18%
    Alternating black and white bars (1 cm) to permit measurements from grossly over- and underexposed photographs

    Photomacrographic Scale (Ruler), White, 4"x4", L-shaped w/ METRIC
    SKU: PSP-ABFO
    Photomacrographic Scale (Ruler), White, 4"x4", L-shaped w/ INCHES
    SKU: PSP-L