Ukidz UGEARS STEM Curvimeter Model Kit - Creative Wooden Model Kits for Adults, Teens and Children - DIY Mechanical Science Kit for Self Assembly - Unique Educational and Engineering 3D Puzzles with AR App

• Size: 4.5 x 3.3 x 6.6 in
• Level: Easy / Number of parts: 109
• Assembly Time: 2 hours
• Recommended Age: 8+
• Package size: 8.1 x 7.4 x 2.5 in

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.