voltage in car cigarette lighter Is it accurate to use a voltmeter with USB plugs to monitor a ? or any other electronic device on the go. Apologies - another question. Will

Apologies another question. Will this work for me to understand the charge level of the 12v battery? I can't remember where the cigarette lighter socket is in the EV3 Compact 7 in 1 Car Cigarette Lighter Splitter with Real Time Voltage Monitor eBay Car cigarette lighter with 4 outlets, 12V 24V, suitable for cars and trucks, with voltage display LIHAN 2 USB Car Charger,12V 24V Voltage Meter, Black Cigarette Lighter USB Adapter with LED Voltage Meter, 12V 24V Car Charger compatible for iPhone, Samsung, iPad, GPS, Dash Cam : Cell Phones

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