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What kinds of batteries is healthy?
When engine running (do not drive), the LED display:
- Between 13.5 to 14.5(12V CAR)
- Between 26.0 to 28.0(24V CAR)
When the engine off, and nothing turned on, the LED display:
- Greater than 12.0(12V CAR) OR 24.0(24V CAR)
Installment:
- Clean the cigar socket.
- Insert the jack of the product into a cigar socket.
With high brightness of LED, there is no difficulty in seeing the display. This digital gauge displays the voltage of batteries in the car.
- Color: Black
- Screen digital color: Red
- Apply for vehicle: 12V or 24V DC
- Input voltage: 12V/24V
- Output voltage: 12-24V DC
- Measuring range: 8V-30V+-1.2% DC
joe
2025-09-05 10:50:37
A voltmeter for vehicles without a voltmeter, to keep a check on your alternator and battery. Works very well, easy to install and very easy to read. Charging condition, battery voltage and starting voltage, great product. Why haven't I found this product sooner? I purchased a Zeltauto LED digital car voltmeter for each of my cars. Well worth the money, everyone vehicle owner should have one!
Alan
2025-07-08 17:36:23
Simple design. Can't speak yet to it's longevity, but arrived quick, in good condition, and works as described.
brupol
2025-06-29 14:26:20
When we arrived on Molokai a few weeks ago, the car we had been assigned to use during our winter vacay had a completely dead battery! Having this device to plug into the accessory port just prior to engaging the starter now tells you the battery level in volts [12.7 or so] and then once running, it measures alternator output of 14.5 volts to show ~good~ charging voltage.
Bill
2025-05-14 14:32:24
There was a blown fuse in the motor on my pontoon boat, so it wasn't charging the battery. So we were happily cruising along, and then the motor quit running and stranded us out on the water, with no prior indication that anything was wrong. I replaced the fuse (never did find out what caused it to blow), and bought this voltmeter so I can tell if it is charging or not. Works great; worth the price.
s
2025-04-08 14:00:11
Great product - works well! My husband uses this in his truck, and he is very pleased with its performance.
Mark Price
2025-03-05 14:06:11
I bought this after I had electrical problems with my truck and I didn't necessarily trust the gauge in it. This hasn't let me down.
Polymath
2025-01-25 10:40:02
Easy to use just plug it into your cigarette lighter
W. Burgess
2025-01-15 17:32:37
I bought a two-pack of these as a cheap voltage monitor for a 12V backup battery. Being an EE, I tested them on my bench for input voltages from 6V to 15V. They both drew 40 mA operating current, which isn't great but isn't horrible either.From 10V to 15V input voltage, one unit consistently displayed 0.2V to 0.3V low, the other 0.4V to 0.6V low. For example, if the actual voltage was 11V, one unit displayed 10.8V, the other 10.5V. Below 9V input voltage, both displays fluctuated over a wide range (as much as ±0.8V!); this range included the correct voltage, so maybe, if one watched the fluctuating reading long enough, one could average out something reasonable in one's head? Do-able, but not fun.A 0.5V offset error is severe for this application, and could lead you to make the wrong decision based on faulty data. It's good these are dirt cheap and come in a two-pack, so you have better odds at getting one that's usable.These can be useful, but only if you (a) determine the offset error with professional gear first, and (b) don't try to measure anything below 10V. For my purposes, I have taped a reminder onto my 0.2V-offset unit, and am discarding the 0.5V-offset unit.
Yves Banaag
2024-12-14 18:53:34
Perfect
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