Third - you don't have to worry much. The main purpose of such a meter is to know does you alternator charge or not. If you see anything over 12V-12.5V it charges and in most cases it charges OK. If your alternator fails and stops charging you will read values of about 11-11.5V or less. Martin Lewis: What the Autumn Statement means for you – including wages, benefits, pensions, ISAs, national insurance and more

As to the accuracy though, keep in mind that the trinket you got is a cheaply made mass produced item. It will have a resistor divider to bring the voltage down to the microcontroller voltage level. But the lower the quality of the item, the more likely that the resistor is not a very precise, and the Analog to Digital converter in the microcontroller they used will not be very accurate. For the most part, this may mean it's off by a fraction of a volt. Not precision laboratory grade. But good enough for your average user. Reliable material: the led panel voltage digital is made of abs, pc, and electronic board, which is safe and reliable to apply, rust and corrosion resistant, giving you a pleasant applying experience led color voltage display】 monitor the vehicle's electrical system. you can know the condition of your vehicle at any time. led indicators help you find the charging port easily without distracting you while driving. multiple safety】 car phone voltmeter charger provide short circuit protection, over voltage protection, over temperature protection, over current protection, under voltage protection, etc. which not only provides safety for your car and charging equipment.

Specifications

usb ports】car phone usb charger is equipped with four charging ports, including qc3.0/18w, pd/20w and dual 2.4a/12w, which can charge four devices at the same time.

led voltage detection】: the cigarette lighter adapter equipped with led digital voltmeter, which can monitor and display the voltage of the vehicle battery in real time,so as to master the health of the vehicle's electrical system. Practical led display: the high-brightness digital tube display is easy to watch, which is convenient for you to know the status of electric quantity in time, and clearly grasp the state of battery voltage between full charged and discharged of this dc voltmeter NatWest, RBS and Ulster Bank to close at least 172 branches in 2023/24 – here's the full list, plus alternatives Autumn Statement: Workers to pay less in national insurance – but rate cuts don't offset the freezing of personal tax thresholdsI don't think there is any equivalent way to load the 12V battery on an EV. To turn on the headlights you need to 'start' the car and that provides electricity from the traction battery. Company policy is that we do not under any circumstances issue instructions to our couriers to leave deliveries unattended when no one is at the delivery location. The Chancellor Jeremy Hunt has today (Wednesday 22 November) announced a range of tax, benefits and savings measures. We round up the key announcements and what they mean for you.

Wide range of application: the small digital voltmeter can adapt to a wide range of 8-30v, whether it is a 15v or 20v motorcycle or other electric vehicle, it can be well adapted, and it can well protect the whole circuit, which can serve you for a long time

Special Notification:

NatWest, Royal Bank of Scotland (RBS) and Ulster Bank, which are all part of the NatWest Group, will now shut at least 172 of their bank branches in 2023 and 2024. A car cigarette lighter or 12V power outlet in a car is, like most everything else, connected directly to the battery positive/alternator output, through a fuse (typically 10 Amp). Sometimes it is connected through the main switched power relay. In any case, aside from the negligible voltage drop across the fuse and wiring, is an accurate measuring point for the voltage in the car. As mentioned, 13.7 is a typical voltage for a car under load while the alternator is running. Martin Lewis: What the Autumn Statement means for you – including wages, benefits, pensions, ISAs, housing, national insurance and more Second - you can't be sure of this meter's accuracy. I don't know the exact product, but most chinese meters may have difference of about +/-0.3V.