There are as many different kinds of digital scales as there are kinds of fish. That's a good thing, since the way you plan to use your scales will determine what model you choose. If you're solely a bass fisherman, scales that weigh fish up to 20 pounds will suffice. However, if you also fish for catfish, a unit that will accurately weigh fish up to 100 pounds is preferable. For saltwater anglers who might catch even bigger fish, look for scales with the highest maximum weight you can find. Depending on your specific usage, scales offer a number of handy features that might fit your needs, including built-in tape measures, pounds/kilograms option, waterproof housing, and taring, a function that allows you to weigh an empty bucket or net, then reset the scale to zero before weighing the container again with live fish in it.