I'm not sure how far you need the signal to travel.
I use Mcmaster-Carr for a lot of stuff. Their website is http://www.mcmaster.com
When there, search for Panel mount thermocouple thermometers. They'll be in the catalog on page 579. With one of these, you still need a thermocouple sensor. For anything more than a few feet away, I'd buy thermocouple wire by the foot. You just twist the ends of the pair of wires together where you want to sense temperature and hook the other end of the thermocouple wire to the thermometer.
Thermocouples produce a tiny voltage, millivolts. So any electrical interference or excessive resistance will affect the reading. For this reason, wire lengths are limited to about 100'. Shielded thermocouple wire can work a little longer than that.
If you go this route, McMaster is great about answering questions.