+1 on the distilled water reading. Basically if the glass isn't cracked and your mass at the bottom of the hydrometer is intact it is probably fine. A slight change in angle could be a very minor shift in the position of the mass at the bottom of the hydrometer. I seriously doubt a deviation of .5 at the end is going to affect your brewing. You usually can't read it quite that accurate with the foam from the wort anyway.
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