Chinese equivalent of "don't judge a book by its cover" idiom?

[someonesomeplace]

Hi all,

Does there exist a proverb or idiom in Chinese that is roughly the equivalent of the English saying, "don't judge a book by its cover?" Need this for a project...

Thanks

[liuzhou]

外表不可靠

[rezaf]

人不可貌相，海水不可斗量

[anonymoose]

牝牡骊黄 but it seems not to be frequently used

[Don_Horhe]

You can also say 以貌取人, used for people rather than objects.

[Kenny同志]

看书不要看封面。

similarily

Don't judge a man by his looks.

看人不要看外表。