Please welcome Eyoyo Underwater Fishing Cameras.https://amzn.to/3siEgXn
It's a scale. I have fishing scales already. I have kitchen scales already.Heck, that thing doesn't seem that accurate, since the guy weighed a "nearly empty" one, and it measured the same as the "half full" one.
junk, ill do the in hand weight and shake test and save my money..