Is this the right digital volt meter

Oh shit,, yea 5v wouldnt, work... What should i do then? I want to be able to monitor my voltage and as of now my headunit doesnt have a voltage meter..

 
newer xm and sirius units run off of 5v, so if you have one of their cigarrete lighter power adapters laying around u can use it to power your first choice.

Or if you have a cigarette lighter sony psp charger, or a cell phone charger that uses mini usb (moto razr, most pocket pc's), or a portable navigation charger that uses mini usb u can use one of these. Reason being is all these chargers use a 12v to 5v step-down transformer.

But if you don't feel like dealing with transformers, you can spend the extra money and buy the 12v ones.

 
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bad @SS chevy

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