I'll counter with
the one I picked up for $45 on Amazon - I was one of the first to purchase, they are $80 now. I still recommend at that price (or even higher.) The only issue is you say 50m, so I'm guessing you're not in the US. These all come from China, however, so I am sure you could get it wherever you are.
My daughter and I shoot 100yd iron sight every month, and we had been borrowing equipment from the club. They have a number of high-end scopes available. We wanted to be able to keep an eye on each others shots from the benches behind the firing line, and also for us to use when not at the match, so I picked up the one above. For $45, I wasn't expecting much.
In short, we no longer borrow the club scopes. It is absolutely brilliant, with edge-to-edge clarity (no aberrations.) The claimed 60x is bunk, but whatever the max actually is, it's plenty to clearly see .22 holes at 100yds. Used it for the first time yesterday at 50 while sighting in a couple of rifle scopes, and backed off on the magnification. It is more than capable for what you describe.
I'm in no way implying expensive optics are not worth the money. I have cheap and mid-range rifle scopes and the more expensive ones are better. In this particular instance, however, my $45 spotter is as good as any expensive one I've looked thru.