I bought this two channel sig gen a while back for roughly $200. I think its funny how it shows so many digits...you can enter 123.48675097328 KHz.
Unfortunately, it uses a (pretty good) crystal osc, so its only accurate to maybe 3ppm. Someone might mistakenly use it & think they are getting all of those other digits.
Someday, I might hook in a Rubidium osc, (have a few somewhere), but would need to figure out where to tap in.