Ah, for roasting....duh....I missed that part of the request, and my roasting thermometer doesn't have a probe. It's this one from SM, which has a tip just like the one you described on yours.
http://www.sweetmarias.com/thermo.digital.K.jpgHowever, for future reference, and for anyone interested, that TruTemp one is very handy. I used it to test the internal temp of bread; I used it last month to ascertain that my fridge didn't need to be replaced; I drop the probe in the kettle to see when the temp gets down to brew temp. I couldn't manage without it.
Susan