I use the automotive style infrared thermometer as well.

The more you pay of course, the better accuracy readings you'll get. I would plan on spending at least $50 for a reasonably accurate one. Check the specs on each unit as you compare them, as accuracy is always listed in plus or minus degrees. Accuracy is more important for medical use of course, than it is for automotive.

If you can, and this is highly recommended, I would correlate and verify the accuracy of your automotive unit with one from a doctor's office. But generally speaking, even though the automotive unit may not be perfectly accurate, they work fine to tell me whether the body part is the same, higher, or lower temperature.

Fluke is a great brand to consider. Raytek is good as well and more inexpensive, and is what I use. Definitely stay away from the real cheap ones. You do get what you pay for here.

Good luck!