What is the best way to test adaptability?

Question

Adaptive design

Subject. I set the minimum width of 410 pixels in the template.
On iPhone 5, the display width is 300 something, respectively, all verification services show that the site is not completely included in it.
But on the test device everything is fine.
Is it worth the steam? Or is it only the newest browsers that compress the site to fit the screen and in fact my site is not optimized for iPhone 5?

Answer 1

iPhone5 has retina x2, that is, it physically has a resolution of 600px but actually 300px, since the screen is small, but the pixel density is double from the standard
mobile safari and chrome can adapt media queries to retina, so you don’t have to worry

Answer 2

So you take the browser around the corner and pull

Answer 3

I check in Google Chrome. There, in the developer panel, you can switch the resolution for the screens of popular devices, or set any width yourself.

Answer 4

There is a mobile-friendly test
in which a preview is given on an iPhone, and I look there, and everything else in the chrome panel is tested.