ultrasonic cleaners

[chippy348]

As per title any one got any feed back on these ?

I am after one for work, been on Ebay but it is a bit of a mind filed with cheap looking models for cleaning watches and jewellery.

I would like to clean carbs, pistons etc.

Like i said i don't know anything about them, they all look to be 40kHz i presume this is the power rating ?

Any help