Gerbview allows the user to do some simple post measurements (distance)

When a gerber file is imported in Gerbview the user has the ability to do simple post measurements. For example, if one should want to measure the distance between a copper plane and an edge. If one needs to know the difference between 'solder mask' en 'solder paste' size this could be handy. There are numerous other occasions which post measurement would come in handy