Gear mentioned in this thread:
Get a Thermapen. Best I've ever used. I have two, one I've used daily for seven years and one that's a couple years old. Expensive at $96 but worth every penny.
I use a Comark pdt300
It's been a good one and is certainly not pricey for what you get. It's probably the best thing on the market with the exception of the above mentioned Thermapen, in an ocean of crappy thermometers on the market today.
The comark is really quick reading, waterproof and fits in a thermometer pocket on a chef's coat easily (big minus on thermapen's part IMO). I never have to calibrate it, it's always accurate.
Be careful Dandal, cake testers are controversial around here. Glad others have seen the light!