I don't really have much use for a light meter, but "Lux Light Meter" seems to have the best reviews. Even if it is not dead-on accurate, if it is consistent and accurate within itself then it can be used for a comparison tool.
I tune all of them with an (expensive) app called TuneLab, usually on a 'Droid notepad, but my phone is a back-up. It is easier, quicker, more consistent, and more accurate, than doing it entirely by ear. Aural tests are always the final check, but it is very rarely that any adjustments need to be made. My clients include Steinway concert artists, recording studios, opera singers, concert halls, as well as many other very talented individuals. They are all very happy with the results. Modern technology has come a long way since tuning forks.