It's officially disallowed by LSAC...my guess is it will depend on the proctor as to how that will be enforced. The only thing you can do is be prepared to use a regular timer (bring one to test site, practice with it a little bit so you're not so dependent on the silent timer).
It sounds so reasonable when you say it.
I bought a $5 kitchen timer from Target (Hamilton Beach, I think).I then opened it up (easy with a wee little screwdriver), and ripped out the noise-maker.Presto! Silent timer!
use a stopwatch, and open it up and take out the speaker plate. its extremely easy, and if you feel like you'll screw it up then buy 2 and experiment the first time. that's what i did but ended up returning the second one because the process was so simple. i think that's your best bet.
how can i prove to the proctors that it makes no noise if they give me crap and say no stop watches?