"The Valve Index Controllers have a joystick, touchpad, two face buttons, a menu button, a trigger, and an array of 87 sensors that allow the controllers to track hand position, finger position, motion, and pressure to create an accurate representation of the user's hand in virtual reality." with a link to Wikipedia: https://en.wikipedia.org/wiki/Valve_Index
The first raw result is: https://www.pocket-lint.com/ar-vr/news/steam/147913-valve-in...
That's the same link as DDG uses as its first result.
The second Google link is a YouTube video (https://www.youtube.com/watch?v=bD8Y9gcPGzs) that has details about "optics and resolution". The second DDG link is about sprinkers (https://www.sprinklersavings.com/blog/how-an-indexing-valve-...).
Google seems a lot better on this query.
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