Here are pics of how to test the cartos from Smokeless Image. Sorry if the picture quality sucks. It was taking with my phone. Hope this helps you.
View attachment 68619
Basic multimeter
View attachment 68620
Step #1
Set the multimeter to the 200 Ω (ohms setting)
View attachment 68621
Step #2
Touch the read lead to the center post
Touch the black lead to the tip of the threading (being carefull not to let the leads touch or cross, otherwise you will get inaccurate reading)
View attachment 68622
Step #3
Take your reading. (I got 2.8 Ω in this test, which is what smokeless image advertises)
good post... I'm about try this now