The good ones do! Magnification is a really important part of range finders, in that is allows the user to actually see their target in high detail, as opposed to having to guess from a distance. For example, m if you are trying to range out a deer that is 1000 yards away, you would have a hard time with it if all you were using were your bare eyes.
A 4x magnification factor, however, brings the target into easy view. Generally speaking, most laser range finders are either 4x or 6x magnifications, though there are probably some exceptions out there. 4x magnification is usually just fine for hunting, while golfers sometimes prefer a 6x magnification because golf balls are so much harder to see.