[Elecraft] K3 - internal TX PWR meter accuracy?

[ON4WIX]

Hi group,

I was just wondering if anyone has done TX power measurements with precision 
measuring gear and compared these measurements against the K3's internal 
indication of the output power?
Just curious here. The K3/100 is advertized as a 100W transceiver (or should 
that be "100W class"?) and the power control on my unit goes up to 120W. 
With the PWR cranked up to 120W the K3's bargraph meter does indeed show 
120W output. The only external measuring tool I have is one of those 
cross-needle meter (Daiwa CN801H) which I know displays the output power a 
few % low into a known good dummy load but I've never been in a position to 
accurately determine just *how much* low. The Daiwa's spec sheet mentions 
10% FS excursion error so that would translate into a 20W uncertainty at the 
200W meter scale setting.
Any input would be much appreciated. I know that there will be no 
discernible difference on the receiving end when going from 90W to 110W but 
as they say... inquiring minds want to know.

73 es tnx

Glenn ON4WIX
K2/100 #5361
K3/100 #192