Ultrasound is a pretty broad spectrum, anything from just above audible at around 20 kHz, right up to medical imaging in the MHz region.
If you're looking for a cleaner, cheap ones can be found on eBay for a few tens of pounds.
Ultrasound is a pretty broad spectrum, anything from just above audible at around 20 kHz, right up to medical imaging in the MHz region.
If you're looking for a cleaner, cheap ones can be found on eBay for a few tens of pounds.