I'm trying to tune my A-110s to very precise frequencies and I'm assuming I'd need some
(probably digital ) device to be able to get one at say 587 Hz and the other at 845Hz. What
devices do people use to get exact tunings with analog oscillators

I'm sure there is something very simple that performs this function, I just don't know what
it's called or where to find it

someone help

Thankyou hugely for your time.