One feature of a monocular that many people do not know exists, is that a monocular can be used as a magnifier. Simply hold it backwards over an object (look through the objective end, rather than the eyepiece) and you will get some magnification. Like any magnifier, how much magnification you get will depend somewhat on how far you hold it from the object you are studying.
No, won’t always be as good an image as you can get from a standard magnifier, but when out in the field, it can be a useful thing to know. I use my Nikon 5x15HG to study flower parts and rocks quite often.