Also, for lower ohm readings, the multimeters aren't that accurate either! Personally, I wouldn't trust any device that hasn't been professionally calibrated when working with resistances below about 0.3. The base error in the devices is too great to be certain about much when you're running that low, and a very small change in resistance is equivalent to an enormous change in amperage drawn from your battery.
(It's one of the reasons why I'm not a fan of extreme sub-ohming, but that's another story).
For "normal" resistance ranges of 1.0 or above, pretty much anything is accurate enough as long as you know the resistance of your leads (multimeter) or the box is calibrated properly to zero.
Thank you Morpheus... I will definitely keep that in mind. And its funny you say that, as one of the other departments at my job is constantly sending machines every week for calibration. As they have a need for measurements to be accurate to certain decimal places... it reminded me of the thread here... They have thousands of measuring devices, maybe I will bring my coils there and get them measured...lol..
Good to know though, I'll also follow your lead and just stick to coils .3 and above...
Best Wishes...