Assemble the Tachometer and discover how it works. The model kit comes with a QR-code to the study guide about the mechanism, the principal of its working, the main characteristics, formulas. It also includes interesting assignments. Dive into augmented reality and look at how the Tachometer works. Interact with the model via a special AR application from Ugears. A tachometer is a device designed to measure the rotational speed of various parts in engines and other mechanisms.