Samsung Magnifier is a tool preinstalled on Samsung devices that lets you use your device as a magnifying glass, making it easier to read any small font or expand the details of any object, for example. This app can only be used on devices from the Korean manufacturer.
This tool opens your device camera with a zoom and all you have to do is focus on any particular thing to see it closer up. If it's not enough to make out what you want to see, just keep zooming in.
Upon opening Samsung Magnifier you can view a small side menu where you'll find three very simple buttons that make it easy to use the tool. With them you can take a photo so you can save the zoomed info, open the flash to read something in the light, or refocus as needed. With these features you can be read any fine print or detect something nearly imperceptible on first glance.