Afschuwelijk geluid dwingt mensen om in hotel te overnachten

[mosquito]

Het verschrikkelijke piep geluid dwingt mensen om in hotel te gaan overnachten.

Bericht:

http://ask.metafilter.com/216467/Bad-Neighbor

Neighbor is using an ultra-high-frequency device against us at very high decibels. It causes constant low-grade nausea and a long-lasting ringing in the ears afterwards. Problem is, it can't really be heard because its such a high-frequency. Cops have come to our house, felt the nausea and ear-ringing themselves, but refuse to do anything about it because they can't "hear" it and we have no way of recording it. My question is: Can you point me towards a device that can record high decibel sound in very high frequencies so we can show objectively that this is happening?