For longer USMS events are there lap counters?

I'm getting back into competitive swimming for the first time since High School and when we used to do the 500y events, there was someone there with a placard to help you count your laps so that in a SCY pool you didn't have to risk losing count of your 20 laps. Is there anything like that for USMS? If not, how do most folks keep count? Swim watches?