Word of advise. Autorange can be fantastic, but measuring something with a constant off and on (
ecig i presume) it may not be all that great.
It will take a second or two for the meter to change ranges, and you may miss what you are looking for. I usually use an auto range, but usually set to the range I am expecting.
This is another reason why an analog meter can be of great advantage. Deflection time of the needle can tell you a lot.
Just my $0.02.