I know it's really a basic question. But I am really confused about this. For selecting a point feature by mouse click, we need to set a tolerance value to create the envelope. And here is the problem lies. in some feature classes points are really so close, for some feature classes, map unit is in feet and for some it is in meter. And the tolerance should vary for these case. For searching feature I personally use
Does there any better option to search a feature from a feature layer? Or does there any way to pick a preferable tolerance?