Digital BW, The Print

Thanks for the kind words Harry.
For a spectrophotometer, the Eye-One by Xrite is the most popular and
compatible handheld device.

A less expensive option is the Colorvision hardware. Techincally
speaking it's a spectrocolorimeter, for what that's worth. It works
with only two products that I know of, namely PrintFix Pro and (with a
workaround) QTR. I'm sure Tobie will provide more details but in my
experience the Colorvision spectro yields very good results for b/w
printing with the latest multi-K Canon, Epson and HP printers.
-- 
amadou diallo
Author, Mastering Digital Black and White
www.masteringdigitalbwbook.com