It very much depends on what kind of glass you're trying to look
through.

http://www.noao.edu/kpno/filters/sgt.html


Roman Black wrote:
>
> robertf wrote:
> >
> > I wonder how they correct for
> > emmisivity(sp)? Has anyone
> > tried doing an accuracy test
> > for something like a Kanthal
> > furnace?
> > What's the max temp on this? I
> > have a need to read a target
> > that is inside a (glass)clear
> > envelope ( also hot) will it
> > read the envelope or the
> > target?
>
> Sorry I forgot to anser your second question.
> I believe it will read the target. I was
> doing the same with the roast in our oven,
> was able to measure the temp difference between
> the meat and metalwork inside the oven through
> the glass door.
>
> Think of it like a light meter, if you point
> it at a bright light source inside a glass,
> or inside a lesser "glow", it will measure the
> most intense light.
> -Roman
>
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