Also- reset any analog watch to the hour at the start of each 35-minute section. You don't have to do the math in your head, and during the LSAT the actual time of day doesn't matter.
Nicer, color-coded LSAT timer watch for $25 with free 2-day Prime shipping on Amazon:
http://www.amazon.com/LSATTimer-Analog-Watch-LSAT-Prep/dp/B006A9SCU0/ref=sr_1_1?ie=UTF8&qid=1391624202&sr=8-1&keywords=180+watch
I think the 180 watch helps you track time accurately and with precision that you may not be able to find by using an analog watch. I have one and I love it.
I don't use the 7sage timer... I use an analog wrist watch and I don't cheat.. its just as good... probably better as your guide on test day will be your watch. Proctor instructions typically vary by a few seconds so it will not be much of an issue.