Simple method of scale

How? First, we find a bamboo chopstick, and then at the thick end of the bamboo chopstick, 1-2 cm, we carve two grooves ab with a knife.

02

Tie the weighing pan to groove A and groove B with thin thread, where the thin thread is used as the handle of the scale, and then tie a lock with thin thread, thus completing the weighing.

03

Lift the handle with one hand and adjust the position of the weight with the other hand until the chopsticks are balanced. This position is the star of the ruler and can be represented by O.

04

Put 50g adjustment weight on the scale, and then adjust the weight until the scale is balanced. This is the weight position of 50g items, and make a good mark.

05

Using the same method, measure and mark the weight positions of100g,150g, 200g and above. After marking, the whole scale is completed.