I got those from Foxx and I like them.Sean, do you have a link to a good set of pro brewer level hydrometers?
Any decent supplier will carry them as a set of three. They're large (~16" long) for high precision, generally cover something like 0-8, 8-16, and 16-24°P, and have a thermometer and correction scale. Just an example: http://www.gwkent.com/plato-hydrometers-with-build-inthermometer.html If you have a Foxx account, theirs are about half the price.
I have one of these and it's nice, but annoying since it's only marked in SG. They're more delicate than the "pro" ones and not as large: http://www.williamsbrewing.com/BREWERS-EDGE-BOTTLING-HYDROMETER-P529C74.aspx
I really like that they have thermometer and adjustment scale build in.