Ellen, what type of cleaning job are you doing ? They’re both
different machines. If you want to clean up after using the abrasive
compounds or polishing agents, then you need the ultrasonic cleaner.
If your finished jewelry has tarnished and you want to remove it,
then use the ionic cleaner; it will also loosen up the dirt that has
accumulated behind the gemstones and bring it back to life. The
ultrasonic machine will not remove tarnish and you should never place
any jewelry with fragile gemstones or stones that have inclusions and
fractures. With the ionic cleaner, such stones are OK.
Min Azama in Tokyo