Re: [Phys-l] IR thermometer buy

[Bernard Cleyet <bernardcleyet@redshift.com>]

More important is the aperture solid angle.  The Alltrade (Costco) is ~ 
0.01 steradian (has LASER).  The Cheapie is 10 X (0.1 steradian).  No 
need for a LASER here!

bc, IR thermometer collector, and unknowingly builder of one in 1954.

p.s. the Alltrade suggests using to measure engine temp., etc.   I use 
it to measure food before consumption and when to open thermal blinds in 
Winter.

Scott Goelzer wrote:

> On Jan 24, 2007, at 2:53 PM, Ludwik Kowalski wrote:
>
>  
>
> > 2) How are these thermometers used, in practice? The role of the laser
> > beam is not clear to me.
> > _______________________________________________________
> > Ludwik Kowalski, a retired physicist
> > 5 Horizon Road, apt. 2702, Fort Lee, NJ, 07024, USA
> > Also an amateur journalist at http://blake.montclair.edu/~kowalskil/ 
> > cf/
> >
> >    
>
> I'll answer the easy one.
>
> The laser is for aiming the sensor at the target. A convenience.
>
>
> I too would be like to know the answer to the other. I thought it was  
> the 'color' of the IR that determined the temp.
>
>
> Scott
>
>
>
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>