My ohm reader is out of batteries so I've been using my istick 100w to check my ohms but it doesn't seem to be accurate. For instance for my tank it reads .26 on my .2 coil. Are all devices accurate on ohms. I ask this cuz i like to super sub ohm, for instance I did a build that usual ohms out to .1 and on the istick it reads .08. (Yes I know about ohms law and safety) .