Skilled electrician question only.?

on your outlet you will stick the probes into the two vertical slots. the more rounded one at the bottom (typically) is your ground. it doesnt really matter which one goes in what hole. it should work either way. but if you really wanted to you could stick your red probe into the shorter slot(hot) and black into longer slot(neutral). if you wanted to test if its grounded or not, stick one probe into the shorter slot and the other probe into the ground(the more rounded one). again it shouldnt matter which one.