High pitch audio frequency measuring
Most common audio equipment is set to match human hearing, 20Hz to 20kHz is their operating range.

So  you want to measure ultrasound, If you want only to measure high frequencies, you can use a bat detector or something to go a bit above 20kHz, it wont be able to detect "normal" sound though.If you want everything from 20Hz to 100kHz or something like that you need a microphone that can deal with this.

https://www.sanken-mic.com/en/product/product.cfm/3.1000400

For the higher frequencies you also need a recorder that can sample quickly enough so what your microphone gets has meaning.