Homebrew PCBs

On Tue, 03 Feb 2004 22:12:47 -0000, Steve <alienrelics@...> wrote:

> Craftsman Infrared non-contact digital thermometer, with laser pointer
> and 6:1 ratio (one inch circle at 6 inches). Up to 6 feet away,
> 518F/270C max.
>
> Number 82327
>
> <http://www.sears.com/sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=TOOL&pid=03482327000>
>
> Sears website says $60 with $10 rebate, but in the store they are
> marked $50 flat, no rebate required.
>
> I've been pointing mine at everything. Our pets, the ceiling, stuff in
> the fridge and freezer, the inside of my computer, myself, etc.
>
> One important thing to know: it's calibrated for an emmissivity of
> 0.97. That means anything light colored is going to read as a lower
> temperature than it really is. Like a silver bottomed iron. Easy fix-
> stick a piece of dark heat resistant tape to the iron. Measure on the
> tape, then measure on the untaped silvery bottom and you have a fudge
> factor. Now you don't need to put the tape on the iron again.
>
> Steve
>

And what exactly is the advantage compared to the temperature probe on the 
multimeter?
i mean the whole thing with the emmisivity is not worth the trouble or not?
the tiny temperature probe on the mutimeter is on equal temp. in 3 
seconds, it reads
up to above 1000 degree C (they say 1200, i really doubt that....).

just wanted to add that, optical is good, like with rpm meters, but it can 
be a disadvantage too...

ST