The reader on the mod should be fine.
Now that 'depends'.
Most mods have to fire the coil in order to read the resistance. So I would not make that a blanket statement. There just might be a mod out there that would blow up in your face. OR .. a mod that you would burn up the ckt. board. OR, .......................
All those mods out there were not created equal.
You can find ohm readers out there for next to nothing ...... so why not have one.
Besides, they make a great little stand to mount your atomizer on while you're working on it.