I have the RH Designs Analyser for my Ilford head. While it doesn't have a uniform density adjustment, it does show what each change will do to the printed density, both in exposure and contrast. It's also an f/stop timer. I would really hate to go back.
Originally Posted by Nicholas Lindan
My other enlarger is for color and has a ZBE head where you can leave the time constant and it adjusts the density (in 1/30th of a stop increments). It is another excellent way of printing.
Either way thinking about adjustments in relative stops sure beats thinking in terms of seconds.