Received an FA-2.
At first I thought the FA-2 had some problems but after about an hour of playing around with it (after not having read the specs closely or the manual at all) I found that the FA-2 is a very nifty device. The ability to see the dBm power reading on the 50 Ohm setting on Channel 1 is very instructional - mostly I purchased the FA-2 to look at frequencies but I think the power reading feature might be my favorite feature.
The LPF feature on Channel 1 is something I’m still trying to get a grip on – I think the specs say 150 kHz but I haven’t figured out how to get it to perform in predicable manner – might be operator error.
I don't have any good way to check the FA-2's accuracy but it seems to show values that are consistent with what other users here have published, and the values seem consistent with what my generator and other counters indicate. So when I say "the device seems to work ok" that just means I can't measure with the accuracy needed to confirm the exact displayed measurements. (There are a lot of digits displayed to the right of the decimal point on the FA-2; accuracy and resolution are two different things, of course.)
The device seems to work ok with an external 10 MHz reference signal or the internal oscillator, and it seems to output a 10 MHz reference signal ok. I'm not sure if the 10 MHz reference output is derived from the internal oscillator or the external reference signal but it outputs the 10 MHz reference signal both when the device is attached to an external reference and when it is operating with the internal oscillator.
Channel 1 toggles between 50 Ohms and 1 MOhm. Initially I couldn't figure out why Channel 2 seemed to show a 10 MHz input signal is about 21 MHz but I figured out that Channel 2 doesn't operate below 20 MHz. (Duh.) When fed a signal of 20 MHz or greater it seems to operate ok (even though the spec says it only starts at 30 MHz). Channel 2 doesn't appear to offer the ability to toggle the impedance or the LPF on and off - as per the other posts here I guess that is by design. Also, as others have reported, with nothing attached to Channel 2 it shows a frequency - on my unit about 3.95 MHz - maybe not ideal but I can live with it.
Overall, it seems like another good and fun product offering a lot of value from BG7TBL.