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I have some budget unbranded one, I've ranged trees out to 800+ with it and it has measured fairly consistently with other rangefinders. But the optics are like looking through a muddy pond, so at...

If you have a topo map and both you and the animal are on clearly identifiable features you can have a decent estimate. But thats a big if, and still not that precise.

It depends how precise/accurate you want to be ;)