We have a nearly new CYMA Technologies Acoustic Meridian Intelligence (AMI) 850 Frequency generator.
I will include a link to their website, but if you're looking at this listing, I assume you have an idea what this is. I have the instruction manual and the shipping box.
New, they cost $6700. I guarantee this works properly.
Here's a link to their site: https://cymatechnologies.com/ami-devices/new-ami-devices/