Another vote for the Spotmeter F/M. The difference is that the Spotmeter F reads flash as well as ambient light, takes a AA battery. The M reads ambient light only, takes an SR-44 6v silver-oxide or 2CR 1/3N 6v lithium battery. They are otherwise extremely similar. These days the F sells for maybe $50 more than the M, so opting for it over the M is not a big deal. Also, it has a dedicated off/on switch, it is easier to preserve the battery life. I had an M and found that the rather expensive SR44 battery did not last nearly as long as I would have liked (I was replacing it every 6 months, which is a pain in the ass if it dies on you when you're 40 miles from the nearest camera store), so I switched to an F and have been very happy ever since.