d2dd4b77___Stamp_Collecting_Accessories__Description
[Accessory] Perforation Gauge [Price Range] $5 [Description] 
Perforation gauge is a tool for measuring perforations in a stamp. They are important for collectors as there are stamps with the same design but different perforations with vastly different catalog values. The unit of measurement is the number of perforations in two centimeters. Most common gauges in the market are good for measuring to the nearest half of a perforation and that serves ample. Recent US issues are an exception as they measure to the nearest 10th. Another purpose served by a more precise gauge that measures size of holes in addition to spacing is in detecting fakes – many fakes appear “correct” in terms of the number of perforations but fall short when measuring the size of individual perforations. For the technically oriented, one alternative is software that measures perforations from a scanned image of the stamp.
One Family's Blog: Stamp Collecting Accessories
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