I definitely recommend the little $20 meter from dishstore.net. My dishes are on my tugboat in Seattle. I have to repoint my dishes from time to time due to fuel usage, dock movement, and traveling to other locations.
With the meter, I can repoint without ever going below decks to look at the TV. I adjust the dish for the loudest signal, turn down the gain on the meter, adjust the dish slightly for the loudest signal, turn down the gain on the meter, adjust the dish very slightly for the loudest signal, and I'm done.
I used to repoint using the display on the TV, but this is MUCH easier. My neighbor on the other side of the dock also has the meter, and he loves it.