Yeah, to start off with, will be more than okay, since the dna goes off what it reads the ohms as and not the exact precise measurement. As long as it's between 0.5-3 ohms, your good to go. You'll eventually want to pick up a dedicate atomizer ohm meter. Makes it easier and much more precise. But with a regulated mod, onboard ohm meter will suffice. Basically how all builders started, except mech user, first time builders, then ya, required tool.
Vape long and Prosper!!!