I am using the Normark Digital scales. I have the 15# and the 5# Precision scales. The 5# Precision scales are really nice for culling.
I watched Roland Martin advertise the "Cull-M-Rite" scales on his show once. I emailed him and he answered. He said that most all of the Pro's are using them. BPS used to carry them but they don't anymore. You can find them if you do a search for "Cull-M-Rite" on the internet. They are about $200.00. They come with the culling tags and they remember each fish's weight and when you catch your 6th fish, It tells you which fish to cull.
Pretty nice, but kind of pricey!
RoyC