The fish counter is a necessity when a person boats (and releases) more fish then they can keep track of.
I never heard of this being used before until I met some of the guys on Pool 4 that hook into 20, 30, 40, 50 or more fish per day.
Off the top of my head, Kerry Harvey and Vandy both use them as they’ve had 80 fish days using the fish counter.
Then there’s people like Pug that just need a counter that goes up to 1…just in case. He’s an optimist.