UGears gears Model ARITHMETIC SET STEM LABAssemble the Arithmetic Kit and discover how the Mechanical Addiator and Mechanical Multiplier work. The model kit comes with a QR code to the study guide about the mechanisms, the principal of their working, the main characteristics, formulas. It also includes interesting assignments. Dive into augmented reality and look at how Mechanical Addiator and Mechanical Multiplier work. Interact with the models via a special AR application from Ugears.