then slip a short thermometer into for a lengthening effect.
No . . . Heat sink grease has a lower thermal conductivity than the metal . . .
it's just a lot better than air. You'll just measure the temperature wherever
the "sensitive" part of the dial's probe is, which will be only slightly
influenced by what makes it "up the rod". There's no practical way to
"conduct" temperature to a remote location and then measure it there. The
better solution (to the long stem dial thermometer problem) is a thermocouple
or RTD in a thermowell (probe) of whatever length you want. You can bend the
probe to whatever shape suits your need (there's just wires in it, after all,
not the mechanical connection that's in a dial thermometer), and it's going to
be more accurate, too.
It's really hard to beat that digital thermometer for $19.95 at:http://www.web-tronics.com/digtherwkpro.htmleven though you'll have to provide your own thermowell to protect the sensor.
At the local Orchard Supply Hardware 1 ft. lengths of 1/8 SS tube are $3.99,
as I recall, and a lifetime supply of heat sink grease (to thermally couple the
bead probe to the tubing) is just a few dollars at Radio Shack, or for $0.99 a
tub at the site above. The local retail walk-in electronics store has
"replacement" thermocouples identical to what comes with the thermometer above
for $7.99 and the Fluke equivalent for a couple dollars more . . . they're
probably available cheaper on line . . . so it's quite feasable to mount
several and experiment, alternately plugging in different probes to see what
they say (another advantage of "going digital"). If you want to read more than
one at the same time, like air temp and bean temp in a hot air machine, adding
a second readout is only $20 more (once the probes are in place). The
"next step up" would be a two channel datalogger (same probes, just plug 'em
in), but that's a couple hundred bucks more still, and would put you square in
the "dedicated goofy" catagory (not that you don't seem to be getting there
in your own way already ).
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