ultrasonic cleaner what is importand HZ''s?

[fxtrader151]

Hi,

I am buying a ultrasonic cleaner for my wife and I have been looking over the various models available. I think, but am not sure, that ultrasonic is defined as above 40k hz. Is this correct? Since I would like to get a realtively inexpensive model and my wife does not need a large cleaner, I have been looking at ultrasonic contact lens cleaners. They are very small, something I desire, and they supposedly operate at 150K hz. Is the higher hz a positive or no?

Thanks

Chris

 

[cflutist]

Check out these

Their "mini" model for home use is $69.95.