This self-descriptive product is, well, a decal used for measuring and oft times found on the gunnel of a boat :). Slap it on a cooler or tackle-box and it could easily be called a tackle-box measuring decal.
What we should point out and here seems as appropriate place as any, is the decal can be cut down to accommodate whatever sized application you need it for. Up to 15" to measure panfish, done. Up to 20" to measure crappie, done. Up to 30" to measure bass, you've got that covered!