This istrument is used to measure distance accurately on maps of all types. it is particular valuable for motorists, cyclists, hikers, etc. and also useful for architects, surveyors, schools and offices.
Direction of use: Set the pointer to 0 by turning the small wheel; then trace the route or distance to be measured with the whell. The pointer will then indicate on the dial the exact distance measured in proportion to the scale of the map.
Scales: 1:15.000, 25.000, 50.000, 100.000, 200.000, 400.000, 500.000, 750.000