Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Ted Bruce KX4OM"
<kilocycles@...> wrote:
>
.
> 
> I preheat the iron to 330 degrees and then iron for 2 minutes using
> moderate pressure, with the temperature still increasing.  I use a
> paper towel between the iron and the paper/PCB; it evens out the heat
> and it minimizes the problems with steam holes in the iron.
> 
> The digital thermometer is one for cooking meat.  I has a sharp-tipped
> probe on the end of a cable, and a digital readout in C or F.  It cost
> $15 from Harry's Market here in Atlanta, a large fresh foods/gourmet
> place.
> 
> Thanks go out to Buddy for the tip on the Office Depot toner.
> 
> Cheers,
> Ted

hi All
Ted mention above that he uses a meat thermometer to measure the
temperature.
I need to do same on a fuser roll, in order to determine the exact
correlation between roll temperature and thermistor sensor output. 
( I have not any kind of technical data for the fuser) 
MY QUESTION PLEASE:
does the meat temperature sensor need to have physical contact with 
the metal I am trying to measure the temperature , or it should be
some how maintained at a short distance of it.  ???
what should give the more real temperature readying ???

thanks in advance

juan