Chatillon scales
http://cgi.ebay.com/Chatillon-Model-...QQcmdZViewItem
Scales such as this one one ebay are very expensive and accurate scales. they come in all different weights. Im sure I have one that only goes up to 1# or 2#. All scales are said to be more accurate as they reach maximum in their range. With that said there was a 5# dig fish scale out years back that im sure would be fine. But one of these chatillon scales will neve need batteries and always work. Recently we had DFG on our day boat and they were weighing with a similar style scale. Mcmaster carr list them but $$$ they are listed under fish scales online page 1538
"Some days im Basstastic other days im crapptacular"