A pointer helps with control because instead of just using your eyes, you can physically move your hand to adjust your reading speed.

阅读时使用指针可以帮你很好地控制速度。

youdao

You Can define the excessive speed of a motor-car in terms of a pointer reading on a speedometer. But Can you define excessive noise in the same way?

你可以根据一个速度表上指针的读数来定义一辆机动车的超速，但是你可以用这种方法来定义噪音超标吗？

youdao

For starters, paging speed is noticeably slower than what you get with a wet pointer finger and the latest issue of, say, People.

FORBES: How digital publications can make browsing easier