My SWR meter is very inaccurate. The more SWR, the larger the inaccuracy. On 80M the rig shows around 1.8 while it actually is around 3. As I tune the band and the actual SWR goes down towards 2.8, the rig shows slightly higher readings (about 2.0).

On 20M the error is smaller and on 10M it seems fairly accurate.

I have been testing this with two external SWR meters. One of them is a calibrated LP-100 Digital Vector RF SWR/Wattmeter.

I have not attempted to calibrate the SWR meter in the FT-2000.