This $3 handheld magnifying glass has two bright LEDs and is powered by 3 AAA cells (not included). The manufacturer says the magnification is 40X. I think it is less than that, but it is still plenty powerful for my needs – mainly, reading the markings on tiny electrical components and checking the layer fusion on 3D printed parts. I have a few different magnifiers, and this one has quickly become my favorite.
It's not like a regular magnifying glass. It's more like a jeweler's loupe. To use it, you hold it up to your eye and move close to the thing you want to look at.
It even comes with a fake leather pouch.