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You answered your own question about the concrete thickness... Could inset a 1/4 plywood bowtie then fill it with stained concrete or epoxy.
If you have an iphone, check out "clinometer" and "Theodolite" apps.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
-- Benjamin Franklin
lib·er·ty
/ˈlibərdē/
noun
1.
the state of being free within society from oppressive restrictions imposed by authority on one's way of life, behavior, or political views
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