Well truth is told I also received a Buzz today as well. And ordered this with it.
Voltage Adapter
It screws it in to the 510 connect the positive and negative and set it to V20 and push the button on your mod. Works on all my batteries and mods.
(I sent a HR playing with it)
But if you set your Volt meter to V20 and put the positive in the center of the atty Connector on the LS and touch the negative to the threads you should be able to read the voltage output.
But found this on a video review that some may wont to look in to. Looks like it will work.
JOKER-DVM
Hope that helps.