I love my spot meter. It does 1 degree, so any reasonable area can be measured. As long as you're on your camera's axis, your readings will give you what you need to determine your exposure. My meter is a newer Gossen Starlite 2, but any decent spot meter will give you what you need.

I've been trying to find an affordable SEI, which is nearly impossible. I have a couple older Gossens from the 60's and they're almost identical in the readings to the new spot mteter, so age isn't too much of a factor.