Unless the mod is not functioning correctly then there's not a great advantage of using a multimeter over a built in meter in a mod, built in meters work just fine. The problem lies elsewhere.
He's using a 3 post atty, which is intended for dual coil setups. Even if he's using the correct wire he said he is attaching the coil legs to the two outside posts which are going to be the same polarity. 0.0 doesn't always mean no resistance. If there is no conductivity a lot of mods will show 0.0 in place of an error code, some will show an error code like "ER" or something.
For starters the guy needs to connect one leg of his coil to an outside post and the other to the inside post (and not even consider dual coils until he gets a few good single coils built), then measure resistance. If he's still getting 0.0 then he's got the wrong wire or he's shorted at the connector or something.
Regardless he's hopeless until he takes responsibility for this endeavor and commits to learning some fundamentals, and maybe keeping an open mind when people try to help him.
False, nobody is hopeless.
The research, openness to advice and learning is key though. Lets not put anybody down, this is the new members forum after all. We don't want him to get frustrated to the point where he quite rebuildables altogether.
You got this Greg. Pinpoint the issue. Your issue is
A. Wrong wire type
Fix: Buy Kanthal/nichrome wire ASAP!
B. Bad connection on the RDA
Fix: fiddle with it and make sure your screws are tight. Fiddling is usually more prevalent with microcoils, especially when steel mesh wicks are involved. Doesn't sound like the case though
C. Positive pin on atomizer not making connection to Mod
Fix: Adjust positive pin (if applicable) or try a new RDA atomizer or different device if you have one
A mech would tell you what kind of wire you were using in a heartbeat. However, I can figure it out with my Provari throwing error codes pretty quick too.
Good luck man