So, I researched many scales that range from small kitchen scales to postage scales. The problem with kitchen scales is that many don't have a very high maximum weight. The largest kitchen scales max at 11 lbs. Once you build your tray you use up 1.5 lbs of that. So, if/once you get large fish they may max your scale out. Postage scales had a much higher maximum weight and aren't much more expensive. They also have a larger platform than the kitchen scales. The scale, tray and sewing mat I settled on can be seen at the following links:

https://www.amazon.com/gp/product/B01MT86A1I/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B01M2V2AFX/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B0027RL0SA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

The total was right at $50 which was a little more than I originally intended to spend. The increase was due to the slightly more expensive scale (battery or A/C power) and purchasing a heavy duty plastic tray that I could only find in a 3-pack vs a cheaper tray. But I am extremely happy with the way the scale turned out. It will be worth every penny. See some pictures of my DIY below.

Attached Images
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NTHA - North Texas Half Acre
Cattle Ranch Ponds