The mezuzah app
However, really, how complicated is all this? You just have to know to:
1) buy a kosher mezuah
2) pick out a cover that fits it and appeals to your taste
3) hang it up on the right side of the doorpost in the bottom of the top third at a slight angle toward the room entered by the door. You really don't need a measuring tape or a level or even a protractor to figure this out. Eyeballed estimates are fine.
This is not rocket science, folks!
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