Crab Gauge for Western Australia

This is a gauge for ensuring that you are getting the right size of Blue Swimmer Crab.

It's set for 127mm, which is correct as of the time of upload. It's worth checking that the printed item matches the specs on this page:
http://rules.fish.wa.gov.au/Species/Index/27

I like to tie the gauge to the scoop net with some flexible wire, so you can easily grab the gauge and measure the crab while it's in the metal scoop. It works well.