The device consists of a c of a resistance arm weight adjust the handheld can be pushed to arm resistance to rotation in different formats, fixed-angle .
The device is composed of Resistivity adjustable arms that can hold the weight transferred to the resistance arm can be rotated in such a constant angle.
The device consists of a brick. An adjustable arms that hold water resistance can be pushed to the heavy arm can be rotated to form resistance angle คงที่ต่างๆ .