1.2" LED Cigarette Lighter Electric Voltage Meter for Auto Car Battery (DC 12/24V)

Pros: Very compact unit with power cord approximately 12 inches in length. I've used it to measure voltage of a lithium cell just to ensure that it works out of the box and it measured the voltage accurately given that it was a single cell (3.7V). Since I have an audio system in the car and often times play music with the car engine off, it's critical to ensure that I don't drain the battery too far to start the vehicle. Car system is ~800W RMS.

Cons: Really can't fault this $6.50 item when it does what it is suppose to. If I would to nitpick, I guess the plastic housing can be made of better quality. Not a con by any means, but to just fill space. The display refresh rate is approximately 1 hz so voltage reading is pretty much in real time. Digits shown is red in colour.

Other: Oh god, they need reduce the minimum text amount for these reviews as it really deters me from writing any further ones cause otherwise I would just have to bs what I type.
Definitely recommend this unit. Small and sleek and doesn't look hideous on your dash area.

Pros: Good to use and see if you car is charging your battery, i'm use in my antique car, my usual car and my motorcycle, its works with all they high brightness, very discrete, very accurate with my multimeter

Cons: The cable is out by side, is better if is by back, and best if have a switch to turn on/off

Other: Good, easy and simple to use

Pros: it really look nice when the red digit light up. look pro. really simple to install. no rocket science needed. just plug and play.

Cons: can't tell is it accurate or not. the housing seems fragile. hope it won't fall apart when i leave it in the vehicle in hot sunny day.

Other: it reall good price for the item. no complain so far. it work fine. get it if you want to add more stuff at your dash board.

Pros: This is a pretty straight forward devce. Plug it into the cigarette lighter power plug, and it'll give you a voltage in the LED display.

Cons: The accuracy isn't 100%. It's off by about 7% in my car, but as a rough gauge, it is fine enough. The plug is a bit brittle and feels like it may break if you have to apply a lot of force to pull it out.

Other: The cable is long to attach it to the power source, and it has a flush back so it could be double-sided taped to a surface easily.

Pros: This little guy is bright, consumes very little power, is large enough to read from across a room, but small enough to wedge into a small corner.

Cons: The cable is rather short. It doesn't work if wired up backwards.

Other: Handy for off-grid solar, I don't see why anyone would want it for a vehicle though.

Pros: The use is very simple. Just put in 12V and they show the voltagem. The price is acceptable, because they work and safe you to get without power to turn the engine.

Cons: Could be less expensive.

Other: I get 3 to lower the price. Maybe buy more if needed. Very good to monitor de voltage of battery while listening sound on car all night. Recommended.