Does anyone have a link to bluegill relative weights in grams? I know I could convert to oz but it seems like it would be more accurate if done in grams

And any advice on a good scale to measure a panfish?

I use an inexpensive digital postal scale. Get one that can run on ac or batteries. Very portable wherever you need it.

I use a digital gram scale that I got from target.

Here's one in grams and centimeters, courtesy of Bruce Condello and BBG...

http://bigbluegill.com/photo/bluegill-relative-weight-chart?context=latest