Topic: Density Testers - seeking opinions

What do you use? What do you like about it? How does it work and do you think I should get one?

There are at least three different styles available, each measuring density in a different way, and there are several different price points. Looking for someone to convince me in one way or another.

M.M.A., D.M.A. University of Illinois at Urbana/Champaign: B.Mus. Lawrence University
Bassoon professor at University of Wisconsin Eau-Claire
Maker of the Little-Jake electric bassoon pickup and Weasel bassoon reeds