Review on 🚗 High-Performance 12-24V LED Digital Car Voltmeter for Optimal Vehicle Voltage Monitoring in Automobiles, Motorcycles, Trucks by Preston Molden

Turn ignition key to accessory position only to read battery voltage (12.6% fully charged, 12.3% half charged). Readings of 14 volts while driving show that the alternator is working and the battery is being charged. Readability is very good unless your accessory slot tilts the display down too much. You can then use pigtail to extend the socket like https://smile.amazon.com/gp/product/B09NLSQRFX/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 but 4 times more expensive than a single digital voltmeter. Four voltmeters can be used in other vehicles or as a gift. Opinion of an electrical engineer