Best place to take temperature readings?

[suicideneil]

It is possible the heatsink is alot cooler than the area where the thermal probe is on the underside of the heatsink, but then again 40 - 140 is a bit more than a slight difference.. Meh, I wouldnt worry too much- try checking the bullet plugs (motor and batt) on the esc to see what temp they read.