I've done this with a parts tester with an ohmmeter and a thermistor before (at lower temperatures). Just be sure to calibrate it! You can do this by measuring the resistance of the thermistor at various known temperatures, then either performing a linear regression or just graphing it in openoffice/Excel. If you're lucky enough to have a datasheet for a thermistor, that sort of works too. Alternatively, you could use the thermistor as a frequency determining resistor in an astable 555 oscillator, then use a frequency counter on your electronics tester if it has that option. While this may seem more complicated, it will be easier to interface the system to a microcontroller if you decide to some day. Finally, it's worth mentioning that an infrared photodiode combined with an op-amp could measure the temperature at a distance, but would be a pain to calibrate.