The Sony US18650VTC5 is not a protected battery. Most IMR or hybrid chemistry batteries are not. They don't need it as they are a "safer" chemistry that will not vent flammable gas if they do vent (it is still possible to make than vent hot gas however if they are abused).
To check voltage, a multi-meter is a great investment. A 510 threaded ohm checker is nice to have also. I have a black box ohm checker/voltage checker as well as a good multimeter.
You pretty much need a meter or two when using mechanical mods.
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I tried a quick google and didn't find anything and don't have time to dig tonight. Would you put more faith in the accuracy of a multimeter than one of these ohm meters? Asking because I heard a lot of the ones on ebay are the same as fast tech which have sketchy reviews on accuracy. I opted for a digital ge multimeter and have been using it, not sure why I just have more trust in a GE reader than no name black box