A Zone VI Compensating Enlarging Timer paired with a Zone VI Compensating Developing Timer.
Test strips and prints are freaking identical. Every single time. Even weekends apart, if I use fresh developer from the same batch.
So consistent it's unnerving.
For perspective, I've even run tests on the developing timer, varying a water bath by 0.1F against my standard mercury thermometer. Moving between 67.9F — 68.0F — 68.1F I've observed the addition or subtraction of ~2 seconds per minute. Rezero and it goes away. Move in the opposite direction and it follows exactly as expected. Back and forth. Consistent as hell.
If the tones are wrong, I can't point fingers. I know it's my fault every time.
I would expect RH Designs more modern hardware might be even better.