ultrasonic cleaners

There are a variety of ultrasonic cleaners out there.  You had mentioned one in one of your

articles..from the micro-tool place.  If I wanted to get a different ultrasonic cleaner...

is there any 'specs' or features that it should have ( or to avoid)  ?

I know you also recommend a certain solution as well.  I can find out that solution by looking at previous posts,

I was more interested in the actual ultrasonic cleaner.

                 Thank you for your time

                               Steve