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Prime Products 12-2020 12 Volt Digital Meter

3.8 out of 5 stars 33 customer reviews

Price: $18.45 & FREE Shipping on orders over $49. Details
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Frequently Bought Together

  • Prime Products 12-2020 12 Volt Digital Meter
  • +
  • INNOVA 3721 Battery and Charging System Monitor
  • +
  • Car Charger - JEBSENS - 4in1 3.1A Fast Dual USB Car Phone Charger, Voltage Meter Monitor USB Car Charger for Smartphone with Blue LED Voltage Amps and Internal Temperature(Fahrenheit) Display - 15W
Total price: $38.42
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Product Information

Technical Details

Brand Prime Products
Item Weight 2.9 ounces
Product Dimensions 7.2 x 2.1 x 1.5 inches
Item model number 12-2020
Manufacturer Part Number 122020

Additional Information

ASIN B002UC4XKO
Customer Reviews
3.8 out of 5 stars 33 customer reviews

3.8 out of 5 stars
Best Sellers Rank #170,045 in Automotive (See top 100)
#324 in Home Improvement > Electrical > Testers > Voltage Testers
Shipping Weight 2.4 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available October 26, 2009

Warranty & Support

Warranty, Parts:Parts
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

Digital voltage meter plugs into cigarette lighter to determine vehicles battery condition. Easy to read digital display shows the exact voltage of battery in 1/10 volt. Low sign appears when voltage drops below 7 volts. Angle of display is adjustable and LED read out is backlit. Reads 0 to 24 volts.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I have 3 of these. I have 2 cars that do not have volt meters. I just plugged them into the 12 volt port. They are always on but very little drain to the battery. I compared the reading with an electrical meter. They are quite accurate. I usually cover the red, yellow and green lights with black tape to cut down on the lights showing at night. The lights (top left) can be bright and bothersome. I'm not interested in the lights, although they do work. I like the digital meter very much. I also wired a 12 volt port on my RV batteries and zip strapped this meter inside the battery box so I can monitor the condition of my batteries. I am very likely to buy this again. They are a handy test tool to plug into a car that might be having a charging / battery issue. Note, the digital readout stops working in extreme heat but returns when the temps return to normal. Not a big issue with me because we live a mild temp region. I have only seen it happen a couple times.
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Verified Purchase
I've tried other digital output meters, but I've found no others this precise and easy to use. Unlike most others it doesn't just tell you "green" for good and "red" for bad, although it does that as well. It tells you exactly the voltage it is seeing, whether for a statically placed battery or an automotive charging system. I have one for each of my three cars and two others for my solar array battery chargers.
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Verified Purchase
As an owner of a single engine airplane, redundancy and the ability to quickly see problems before or as they develop is essential to survival, especially at night when electrical loads are at their peak. I bought this tool over 20 years ago and it’s worked flawlessly. I accidently broke it when my knee hit it hard one night. There is also another version, with left row diagnosis for the alternator separate of the battery. I just bought 2 of those as well.
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Verified Purchase
It came in a very timely manner. I used on an trailer. It seemed to work but I have to use it again to really tell. Anyway it made me feel comfortable in the fact that the battery was not going dead during dry camping (four days).
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Verified Purchase
A great way to monitor your deep cycle RV battery to avoid too many deep cycles. RV deep cycles batteries last a lot longer if you monitor them and keep them from ever going below low 12s (in voltage) between charges. This is a great device for doing that.
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Verified Purchase
Works as advertised, & shipped promptly. The digital display is very helpful to determine the charging system is functioning properly, & the battery is fully charged, or has a bad cell. I keep one in my toolbox all the time.
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By Greg L. on February 12, 2014
Verified Purchase
I bought this product in Dec 2013. When it arrived, I plugged it into the cigarette lighter and watched the display. I noticed that all three of the "bar-graph" indicator lights (red, amber, and green), lit up, but stayed on together(just like it's pictured above)... ? I wasn't sure if that was what was supposed to happen; seemed to me that only one light should be on at a time, indicating the condition of the Battery charge & alternator.

I watched the numeric display as well, and it was reading 13.5V, then maybe ten minutes later it would go down to 13.4V then fifteen mins later, back up to 13.5. I really couldn't tell for sure, but I knew that something was wrong. Turns out that it wasn't posting the car's voltage in "Real time". What it was doing was "sampling"... (taking the voltage and "PRINTING" it). That's no good if you're trying to evaluate your battery's condition, and the ability of your alternator to "keep-up" with the car's constantly changing electrical load; should there be a sudden (intermittent) drop in voltage, that's important, you'd need to know that!

Unfortunately for me, I'm not able to get a refund, as it took too long for me to determine just what this meter was doing. I ended up buying another (similar) meter by a company called "INNOVA"; not sure if I'm allowed to post a link, so I won't, but you should see it when you search for: "12 volt Battery and Charging System Monitor" here on amazon. This one works just as it should. It updates in "Real time", so you see the numbers changing as the battery voltage fluctuates. And... you'll see only one "bar-graph" light on (Green, amber, or red), at a time! I'm giving Prime Products 12-2020 digital meter one star, and I think that I'm being very generous!
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Verified Purchase
This lacks a light to see the LCD at night. I have to rely on the colored lights. I know that as long as I see the green light, I am OK. In three of my cars, I lack room to install a permanent voltmeter. I insert this in the cigarette lighter socket when I am taking a long trip. I have gotten stuck twice on trips before when the alternator failed. With this portable voltmeter, I will be able to see when the alternator fails next time and get help before it is too late. (I live in the desert and blown sand does nasty things to the parts of an alternator).
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