Welcome to the forum.
The Digisat will work just fine. This is the same as our Acutrac22 signal meter:
http://sadoun.com/Sat/Products/Acces...Accutrac22.htm
Once you point your dish in the approximate direction, use the meter along with your receiver and TV to peak the signal strength and quality.
Watch out for DirecTV satellite on 101W. It has a strong signal (100W) compared to the weaker T5. It could trick you!. If you notice the signal meter going through the roof, but no quality on your screen, turn the dish about 4 degrees to the left (EAST).
The secret to a fast dish alignment is a "100% Vertical mast".
Good Luck!