Hi,
Funny thing, yesterday I´ve spotted the 4410 for the first time...
Wasn´t aware of the 45-series, until now.
The only 2 differences I can see so far:
4410 got several testfrequencies in fixed steps, the 4510 got continously adjustable frequencies in 1Hz steps.
Same with the testlevel, 4410 several in fixed steps, 4510 continously in 1mV steps.
Martin