Many items have been used as scale markers in impression photographs. These include coins, pens, dollar bills, etc. These types of scales can create problems when attempting to produce a natural size image. The scale used should correspond in size with the size of the footwear or tire impression. A coin would be a relatively small scale in comparison to an impression from a size 13 shoe. Not all pens are the same size, so the pen used in the photograph may need to be submitted with the photographs for examinations. A thin, rigid, non-metallic ruler provides a much more uniform scale.
