As a follow up to my post on Mod Battery Safety I will add the video below by GeekGirlVaper on how to use a digital multi-meter. They are a good tool to have for battery safety, and are not difficult to use. The video is by a vaper so it specifically shows how to use a mutli-meter for vaping needs. The main thing to remember with these it to set them at a higher voltage then the battery you are measuring. e.g. If your battery is in the 3.7-4.2 volt range, set the multi-meter at 20v.
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