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You'll find touchscreens employed in all sorts of devices. They can work on a number of different technologies, while the most common is capacitive technology. You can find touchscreens that are a portable 10.5", or more serious monitors that measure 19.5", 22", or even 24" along the diagonal. If you're a hobbyist into Raspberry Pi and the like, you can even find a tiny 7" touchscreen display. You also want to look at the response time of the screen: how long does it take for the screen to respond upon being touched. It is standard to have a response time of 5 milliseconds. You should look at the different types of peripheral connectors for your touchscreen: VGA, DVI, USB, and/or HDMI.