I would be looking in the ~25 - 30 kHz frequency range, and the probe size would be small, like a dental pick or even a 5 inch sewing needle.
Are the cheap cleaners you mention the source of the 40 kHz transducers?
I would be looking in the ~25 - 30 kHz frequency range, and the probe size would be small, like a dental pick or even a 5 inch sewing needle.
Are the cheap cleaners you mention the source of the 40 kHz transducers?