What you get from Netflix depends on the device you're using. Image: Mathieu Improvisato/Unsplash Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. When you sign up for Netflix , you get a choice of price points, which then  affects the quality of the streams you’ll see, how many streams you can set going simultaneously, and how many ads pop up. What you might not know is that the video quality is affected by something else: The device you’re watching on. You might end up paying for 4K video without actually seeing that many pixels, as we’ll explain here. At the time of writing, these are your Netflix plan choices: Standard with Ads: $8.99 per month, 1080p video quality, 2 simultaneous streams, up to 2 devices for offline viewing, and adverts. Standard: $19.99 per month, 1080p video quality, 2 simultaneous streams, up to 2 devices for offline viewing, and no adverts.…