The Curvimeter - or opisometer - is a device that measures the length of curved lines and helps to calculate the distance between the points on a map more precisely than a ruler or a compass.

The mechanism has a measuring wheel, a clock face, and a hand.

When the wheel moves along the line on a map that you need to measure, the hand moves around the clock face marked with measuring units - centimeters, inches, etc.

All you need to do in the end is to check the map scale and to multiply your data by the denominator in the scale.

• Age: 8 years and up
• Product Dimensions: 11.5 x 10.3 x 5.7 cms
• Package Dimensions:20 x 19 x 6 cms
• Self-assembled (no glue or cutting)
• Parts are pre-cut and easily removable from board
• Assembly instructions included