> If you're in the US:
> 
> http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3305
> Harbor Freight makes dirt-cheap, poorly-constructed items that don't last
> long (cheap chinese imports), but if you're using something for hobby
> purposes, they can be a really good deal. What I tell people is that HF
> stuff lasts 1/2 as long as a "real" brand, and costs 1/3 as much.
> 
> I'm lucky enough to live 15 miles away from one. I have two of these
> cleaners, and they do work on jewelry. My professional dental one I got as
a
> cast-off from a dentist buddy.


The difference is that the cheaper ones tend to have 'hot spots', the
expensive ones are more uniform.  Or are supposed to be.

You can test for these by hanging a piece of aluminium foil in the tub, the
ultrasonics will punch holes it in.  By putting it in various places you can
find the weak & strong areas.

Of course if nothing happens to the foil then your cleaner is broken.

Tony

(I can hear the sound of people rushing off to play from here...)

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist