Rotary handles are widely used in machinery, tools, toys, and electronic devices. In machinery, they are often used to control the speed of motors or samplers. In electronic devices, they can be used to control volume and brightness.

Rotary handles are widely used in machinery, tools, toys, and electronic devices. In machinery, they are often used to control the speed of motors or samplers. In electronic devices, they can be used to control volume and brightness.
