Digital BW, The Print

Hi!

I'm about to buy a densitometer, probably an X-rite, for measuring my 
B&W prints, and before I buy such an expensive -even when second hand-
  device, I want to know for sure: is a COLOR densitometer suitable 
for B&W?
Or is it better to buy a densitometer that does only B&W?

Thanks!

I g o r
Amsterdam