This 15L Mechanical Dial model performs very well & the size is great for cleaning car parts, antique clock mechanisms, tractor carbs etc, mainly what I bought it for plus so Im happy. It just done a fantastic job cleaning my antique brass clock mechanism (Junghans) that was filthy after 123yrs of daily running. I used a 1/2 cup of acetone in simple green & it done wonders.
For carbs I up the acetone to a full cup or use Zep 505 if extra grimy. Generally (1 to 3) 10 min cycles does a great job for most parts I clean & always rinse the parts well as some chems continue to etch metals over time.
I prefer mechanical dial cleaners over digital models with a sticker control panel as these last much longer.
I'm very happy with this unit, it works really well.
Btw It has 2 transducers, anything below a 15l has only one transducer doing all the work.