This seems as good a place as any to ask this... When building coils, is it necessary to use an ohm meter to check resistance if you have a device that does the job itself?
Hm, depends. Most devices (ie: the IPV3) only read the device attached once you hit the fire button. This kind of defeats the point of reading your ohms BEFORE you fire your device. If you happen to have made some kind of dead-short massively-failing coil, do you really want to leave it up to the Chinese internals to catch that, and hopefully read "low atomizer"? If the failsafes don't work for some reason, you know what's gonna happen, right?
So the answer is yes and no, but if you're using something that needs to be fired before it'll give you the ohms, it's at your own risk. Usually I'll throw fresh builds on my MVP2
after using an ohm reader just to check the ohms a second time, make sure they're not fluctuating now that the device is actually assembled and whatnot.