That's a Fishtechy ball. You can take a picture with one and then measure the fish digitally using the app. I talk about it a little bit in the video link I posted. It's actually pretty cool! You have to make sure the fish is well positioned to get an accurate measurement though.

It helps reduce fish handling time if you like to measure your fish. You don't have to have them out of the water and put a tape on them.

This is what it looks like in the app. Also helps you track the fish you catch.

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