light pen

Do you prefer the feel of a light pen or a heavy one?

By contrast, the picture telephone and a demonstration of a light pen captured my imagination.

In an experiment, the pair asked users to try out the mouse alongside other pointing devices such as a light pen or joystick - and found that the mouse was the clear favourite.

A middle-aged man playing with a light pen is not the Large Hadron Collider.

Mili had come up with a way to photograph trails of light, and he wanted to shoot Picasso “drawing” in midair with a light pen — a process that would leave no trace except on film.