Is there a fish tape out there - or a leader - that makes an audible noise for locating it in conduit

Basically as the title says, I’ve been making due with just deduction, but there are a number of absolutely insane conduit runs in my house. It would be helpful if I could run the fishtape partiallly through and hear what box it ends up stuck in…

I tried searching for it, but all of the ones I have found emit a non audible signal which I believe won’t work in metal conduit since it will just act as a faraday cage.

I could try to find some low profile battery powered module - but was curious if my google-fu just sucks.

Tried searching for “fish tape with audible locator” or “audible locator leader” and got nothing.