No Ohms Being Read?

I just got my new petri RDA and put the coils on that came with it. Installed it properly as far as i know. I dont have an ohm tester however and when i plug the Petri onto my 20W eleaf istick (to try and see if it would come up with an ohm reading) it just said 0.0 ohms.

Is this just because the istick is 20w and cant handle subohm builds?

How do i go about testing the ohms without an ohm reader  


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