It's not worth carrying a locking and/or one hand opening knife or multi-tool in NYC. I was going to suggest that a leatherman juice s2 was probably acceptable - but I just opened the (non-locking) blade one-handed!

If you need a multi-tool for your job (I don't) than I'd suggest you carry something like a rebar, with the blades inside, not one hand opening, and not carry it on your person, but in your carry case/bag. Unless they suspect you're a terrorist, the police are not going to check. I would never take any of these tools out in public, not even the SAK to clean your fingernails.

I spoke with an NY police LT. friend of mine several years ago - I had some sort of one hand opening pocket knife I was using - and without joking around, he made it clear that a hand hand opening and locking blade - not welcomed in the Big Apple.