Dear valued customer,
In the photos some shadows are seen, they are generated by the scanner, that does not happen in reality
Transparent perforation meter (odontometer)
measurements: 2 19/32 x 5 x 0.004 inches
ruler precision: 1/10 millimeter (0.0039 inches)
perforation gauge precision: 1/10 continuous
Range of perforations to be measured: from 4.9 to 18.2 perforations for every 2 centimeters.
The thickness of 0.004 "(4 thousandths) allows to avoid the distortion caused by the inclination of the sight.
Being transparent, it allows measurements with the ruler to be very precise since the device is superimposed on the image to be measured. Of course it would be highly recommended to use a magnifying glass when making the measurement.
Printed with laser technology, which generates a lot of precision and there is no ink wear.
Easy to store and clean.