Description
ABFO Photomacrographic Scales is the gold standard for forensic professionals and medical examiners who require absolute precision in evidence documentation. This rigid, L-shaped tool provides the necessary geometric references to ensure that photographic evidence is both accurate and court-admissible.
Technical Specifications
Constructed from 1 mm thick laminated plastic, this scale is built for durability and precision. The overall dimensions are 5 cm x 5 cm, featuring millimetre markings accurate to 0.1 mm or better. These exact graduations allow for the highest level of detail when capturing bite marks, injuries, or small trace evidence.
Advanced Distortion Correction
One of the most critical features of the ABFO No. 2 Scale is the inclusion of three circles. These circular references are vital for compensating for the distortion caused by oblique camera angles. Furthermore, while the primary graduations are metric, the legs are exactly 1 inch wide. This unique design allows investigators to extend the 1-cm division lines across a photographic print to create a grid image. By measuring relative to these inscribed grid lines, analysts can effectively correct for non-parallelism between the camera film and the object plane.
Visual Reference and Exposure Control
The ABFO Photomacrographic Scales is engineered to perform under challenging lighting conditions. The grey areas possess a reflectance value of approximately 18%, providing a neutral reference for exposure. Additionally, the scale features alternating black and white bars (1 cm). These high-contrast segments ensure that measurements remain possible even in grossly overexposed or underexposed photographs, where finer markings might disappear.
Professional Forensic Use
Whether documenting a crime scene or performing clinical photography, the ABFO Photomacrographic Scale provides the objective data required for laboratory comparison and legal scrutiny. Its ability to facilitate 1:1 reproduction makes it an essential tool for any forensic kit.
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