This is a small and inexpensive but capable multi-meter that can be used to test electronic cigarette batteries, atomizers and "mod" devices.

Now if you intend to use a meter all the time then I suggest purchasing a Fluke.  If you don't want to spend $80-$150 and only need it occasionally, then this is perfect.

If you want to know if that atomizer REALLY is bad, you can find out very quickly.

It will do basic tests such as:

Voltage test (DC and AC) for testing your batteries
Impedance test (Ohms) for testing your atomizers
Continuity test for checking switches and so forth