An input device that provides a scalar value, e. g., a thumb wheel, a potentiometer.

一种提供标量值的输入设备，如姆指旋转控制器、电位计。

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Depth setting - an Indexed thumb wheel allows for accurate and repeatable depth Settings of fasteners.

深度设定-一个索引拇指轮允许精确和可重复的紧固件深度设置。

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The thumb wheel is used to set almost everything in the camera and it is tiny, slippery and hard to turn.

拇指滚轮用于设置在相机几乎一切，这是微小的，滑溜溜，难以转动。

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We never really found ourselves using the thumb wheel in our first-person shooters, but you can think of it as a two-way rotating programmable button if you will, and it spins in small enough increments to find use as a weapon or ability switcher.

ENGADGET: Exclusive: Mad Catz Cyborg Rat 9 review

Key presses were comfortable and we're intrigued as to how the thumb-wheel module would fare once we got used to it.

ENGADGET: Mad Catz S.T.R.I.K.E. 7 gaming keyboard announced at Gamescom (hands-on)

An active palm rest rounds out the modules, with a thumb-wheel and additional action button -- it's joined by a pair of (yet again) adjustable wrist rests that anchor along the bottom edge.

ENGADGET: Mad Catz S.T.R.I.K.E. 7 gaming keyboard announced at Gamescom (hands-on)