Lightning ABFO No. 2 Photomacrographic Scale, 5 Pack, 6-3875

ABFO No. 2 Photomacrographic Scale

The Authorized ABFO No. 2 Photomacrographic Scale. Designed by the American Board of Forensic Odontology, this scale has become the standard for bitemark measurement and photography.

Features:

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

The incorporation of three circles is useful in helping to compensate for distortion resulting from oblique camera angles. The graduations are all metric, except for the width of the legs which are 1-inch wide. The 1-cm division lines are traced and extended across the photographic print to grid an image. Measurements within the image are then made relative to these inscribed 1-cm grid lines to compensate for any distortion resulting from non-parallelism between the film and the object planes. For an in-depth technical description on the use of this scale, read the article by William G. Hyzer and Dr. Thomas C. Krauss in the Journal of Forensic Sciences, Vol. 33, No. 2, March 1988.