Photomicrograph scale marker

A slide-ruler used to apply scale marks to photomicrographs. There are four scale lines for producing scale marks of 10 microns, 1 micron, 0.1 micron (100nm) and 10nm. The scale marker is also used in measuring the real life size of an object in a micrograph. It is made from a clear flexible plastic and it is protected by an enclosed pouch. Instructions are included. Printed in English, German, and French.