Tricky question, depends on their single resolution they run on, but the widget can not know which monitor the mouse runs in. A 39'' would be the best choice if both monitors got the same pixelwidth (i.e. 1600x1200). Otherwise I would suggest to middle the value (don't faint now):
19'' 1200 25.4*19/1200 ->1px= 0.402167 mm
20'' 1600 25.4*20/1600->1px= 0.3175 mm
med=0.359833 * 2800/25.4 --> 39.66666
This value is arguable, maybe you work more on the 20'…9; so the metric travel distance is shorter (pixels are invariant to this).

I would not meditate too much about it, just sum up the 2 monitors :lol:

You can change display size whenever you like, the resulting travel distance is always calculated real-time (technically spoken: it saves the pixels and not the 'real' distance. For display it calculates the distance using your current display size and chosen unit).

Keep in mind, this tool is not meant to be More

What settings should I use if I have my desktop extended onto a second monitor? One is 19" and the other is 20".

Great idea for a widget - can't wait to start using it!

Thanks for all the feedback.

Some remarks:

Display size versus pixels: Actual pixel size is different between displays. a 17'' with 800x600 has larger pixels than a 17'' with 1280x768, so setting your physical screen size will allow a more accurate estimation of distance (still not accurate, you might have a black border).

Click count: the current konfabulator engine does not allow to hook into the keyboard chain. Maybe future versions will, then I will update this widget too...er).

HTH

Excellent. I'm up to 250 metres already and I haven't done much on my PC!

You can reset all widgets at startup pressing CTRL at the same time.
What font you change, what OS, did you resize, did you restart the whole engine?