I've never seen a referee use one before that's why I ask. I just don't see the real need for one because I've never had to call delay of game either, I just enourage teams to hustle up and threaten delay of game. I imagine you're doing HS because I'm pretty sure in NCAA the timer is responsibile for 20 second count.
Anyways I remembered seeing a timer ad in one of my rulebooks. The downside is it was the football rule book. Take a look at that, that's the best I could do.
http://www.grimmscientific.com/readyref.html
Also I'm going to send an email to someone that might know, I will let you know what I find out.
[Edited by Snake~eyes on Sep 19th, 2003 at 10:25 AM]