Wearing a watch

[Bluefoot]

(Rather than hijack the Time Limit thread, I've started this new one.)

I wear a watch for my Men's ASA Slow Pitch leagues. Else how would I know exactly when game time is I also use it when I need to time the minute between half innings.

I can't find anywhere in the ASA Rule Book that states that umpires aren't supposed to wear a watch (as per the other thread). Am I missing something somewhere?

If we are not supposed to wear a watch, then how are we supposed to judge time for all of the instances that are required of us that are stated in the rule book? (should we count "one-one thousand, two-one thousand, etc.)

I've not worked NFHS yet, but are those umpires allowed to wear watches?