Hi everyone. I am putting a prehund door into the rough opening. I want to
make sure my door is not twisted in the rough opening. When I say twisted,
I mean that one door jamb doesn't stick out further than the other. Is
there a special tool to check for this. I will draw a picture below, using
J for the door jambs and l for the level. However I don't think this is how
to check this. Any help is greatly appreciated. Thanks.


J J
J J
JLLLLJ
J J
J J