Ok, so I've never really been all that good at math, so perhaps the issue that I'm running into is the fact that I'm just a dumb and fat American. Now that we've got that out of the way, to the issue at hand.

I've been hearing random reports about how the WMO's dpi is actually something other than 400dpi. I've been hearing anything from 420 to 450ish. This got me thinking and somewhat reminded me that doing dpi conversions from my WMO to my Salmosa never really seemed to make any sense and pan out like it was supposed to. Deciding to do a little investigating on my own, I brought up MS Paint and set the properties of the canvas to 400x400dpi. I then measured (as accurately as one can with fingernails, a ruler and a steady hand) and came to an average dpi for my WMO on my QcK heavy to be around 350dpi. That's a whole 50 dpi LESS than than what I've been hearing. My math: 400dpi / 1.125 inches = 355.56 dpi. So...is this right? Am I doing something wrong? Sparking my curiosity even further I decided to go ahead and test my Salmosa on the same pad. I changed the Paint canvas to 800x800 (for simplicity's sake) and measured the exact same way. Lo and behold I came up with 1.063 inches for covering 800dpi worth of ground. Work the math, I come up with 752.59 dpi. So at least in this regard I seem to be consistent, but a whole 50 dpi less than what the mouse is actually supposed to be?

tl;dr: WMO = 356 dpi? Salmosa @ 800dpi = 753 dpi? Iz I dum?