I grabbed a great deal on a Ultra Sonic Cleaner that was a display. Got everything but the box I think. Thing is how can I be sure it is working? I know clean something. I ran some coins thru the cycle and couldn't see any difference in them. Only used water with a few drops of dishwashing liquid. Thought I read somewhere that it would work. Only got 5 days to return if it don't work. Dodn't want to make mess til I really got ready to use it. Is there a simple test for it? I think it is big enough to do carbs one at a time. New Toy??