Stanley Gibbons Instanta Perforation Gauge

- an indispensible tool for measuring perforations on stamps to one decimal point.

The perforation gauge measures the number of perforations within the measure of 2 centimetres. Perforations are a stamp’s ‘teeth’ and their measurements vary according to the type of perforating machine used. Often the stamp’s top and bottom ‘perfs’ differ from those at the sides (called a ‘compound perforation’), and measurements range from 7 (large holes) to about 18 (small holes).