vincent,
Buy a PACT timer, either the MKIV (which I have) or the Club Timer II. The MKIV is a bit large to wear on your belt. PACT has both models on sale now - MKIV- $200 and the CT II - $130 - you can order direct from PACT at
www.pact.com
PACT is one of those companies that is great to do business with, NO BS lifetime warranty ala Dillon + great service.