UGEARS STEM Counter 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 App

The mechanism of the Counter is composed of a click-button to register values cylinder gears with numbers the Geneva drive a handle to register values Model size: 5.3 * 2.6 * 4.8 in (13.5 * 6.5 * 12.2 cm) Model size: 5.3 * 2.6 * 4.8 in (13.5 * 6.5 * 12.2 cm) Package size: 8.1 * 7.4 * 2.5 in (20.5 * 18.8 * 6.3 cm) Parts count: 157 Assembly time: hrs: 1-2 The parts can be easily assembled. They are pulled out from wooden boards and then put together with the help of an easy-to-follow instruction manual. No glue or cutting needed. Package includes: wooden boards with pre-cut parts and other supplies a pocket model’s study guide