Hi,
So you have a raw reading which you want to divide by 1.64, is that correct? Or do you want to multiply the raw value by 1.64?

TempC = TempC ** 39961 ' Multiplu by 0.60976 which is the same as dividing by 1.64

or

TempC = TempC */ 420 ' Multiply by ~1.641

or

TempC = TempC + (TempC ** 41943) ' Multiply by 0.64 and add result to previous value.

If neither of these works can you give us a bit more details about how the raw values correlates to actual temperature. Ie what raw value do you get at 0 temp and what raw value do you get at max temp (500 degrees in this case).

/Henrik.