I have a medical grade one I got off of Ebay as "Parts only" but it just needed a knob. I run all kinds of stuff through it. A great tip to keep things organized and clean is to use glass jars and vases. The frequencies go through the glass and it is easier to clean out the jars than the unit. You can also put those tall glass vases in it to do long items. As long as the bottom is in the water it will travel all the way up.
