I'm a little sceptical of it's accuracy. Hooked it up to my PC (e4300, 965p-DS3, 2 x HDD, 7900GS). Playing Flight Simulator X (which is fairly taxing on CPU and Video), and the whole lot was only drawing 135 watts. With both CPUs at full ball in TAT i manage to squeeze 150w. Hooked it up to my clothes iron and it drew 2250 watts which seems about right. So I am really confused. Anyone offer any insight?