Japanese experiments Games with numbers

The “Games with Numbers” set will tell and show what the weight of objects is and how much common things weigh. How to use lever scales, and what kind of device it is, does the shape of an object affect... its weight, how to balance scales with unequal weights - these and many other experiments can be performed using this set!
The set includes a stand, a pointer, a scale, weights in the form of numbers, a stand, a rocker arm, a thrust bearing (the axis of rotation of the rocker arm), a thread, a metal hook, a correction weight, and illustrated instructions.