Sorry, Derel, for being a bit over the top on this but the OP was about wondering if a hand held meter would be beneficial to "him". He was already aware of the uses in the studio and it wouldn't be a stretch I think to include controlled lighting in that. What he was referring to was an outdoor situation and having a hand held meter will not do anyone any good without knowing how to use it but being comfortable enough with it so that they will in fact use it. This thread wasn't about commercial photography or wedding photography or hiring anybody to do anything but simply photographing things that you can't just walk up to.
As it turns out I do know how to use a flash meter, an incident/reflective meter and a spot meter and own at least one of each. I also have a passing acquaintance with the zone system. So instead of lets all getting together and thumping our chests over how good we are and how much we know, why not try and help a fellow photographer out by giving him/her some advice they can/will use? Such as doing a little reading on the Zone System and using what you have to see if it helps you any. After that if you like the system then you can look into proper tools for using it.