True® Single Meter Dual Display
12v Dual Battery Voltage Meter – Gauge
Price range: $40.95 through $60.95
Monitor two 12V batteries simultaneously with the True® Single Meter Dual Display Voltage Gauge. Designed for UTVs, RVs, boats, and off-road vehicles, this compact, waterproof meter features dual blue LED readouts, reverse polarity protection, and easy installation for reliable, real-time voltage tracking.
- Bright dual blue LED display
- Durable & Weatherproof Design
- Displays real-time voltage for two separate 12V batteries simultaneously
Kit Inclusions
True® Voltmeter Kit Inclusion:
- Fits a standard auxiliary power source whole
- Dual Blue LED readouts on one unit
- Includes heat-shrink wire terminals for secure application
- 8ft of duplex connection wire
- Harness and Relay
Truck or car voltmeter dual display instructions
FAQ's
Can You Use the True Dual Display Voltmeter on Lithium Vehicle Batteries?
Absolutely — the True® Dual Display Voltmeter is well-suited for lithium batteries in vehicles. It’s designed to monitor two separate 12V battery systems, and lithium batteries fall right within its supported voltage range of 0–30V
How is a voltmeter connected in a circuit?
Always in parallel with the component or section being measured.
Why must a voltmeter have high internal resistance?
To prevent drawing significant current that could affect circuit behavior.
Can a voltmeter measure current?
Not directly—use Ohm’s Law or an ammeter for current measurements.
Can a voltmeter test a battery?
Yes, it helps determine a battery’s charge level by checking its voltage.
What happens if a voltmeter is connected in series?
It disrupts the circuit due to high resistance and may stop current flow.
What does it mean if a voltmeter reads near zero?
Could indicate a short circuit, disconnected part, or inactive voltage source.
What’s the difference between analog and digital voltmeters?
Analog uses a needle and scale; digital shows readings numerically and is more accurate.
Can a voltmeter measure AC and DC voltage?
Yes—most modern voltmeters can measure both AC and DC. Just select the correct mode.
🔧 Key Features
Key Features of the True® 12V Dual Battery Voltmeter Kit:
- Dual Voltage Monitoring: Displays voltage of two 12V batteries simultaneously for real-time health and performance tracking.
- High-Accuracy Readings: Provides exact voltage readings for dependable monitoring in critical applications.
- Compact and Durable Design: Built for harsh conditions—ideal for cars, boats, RVs, SXS, and off-road use.
- LED Display: Bright, easy-to-read LED screen ensures visibility even in low light.
- Wide Voltage Range: Monitors 0–30V across both main and auxiliary batteries.
- Easy Installation: Includes all wiring and connectors for hassle-free setup.
- Reverse Polarity Protection: Safeguards against incorrect wiring to protect the device and batteries.
- Energy-efficient: Low power consumption prevents unnecessary battery drain.
- Versatile Application: Suitable for vehicles, UTVs, off-roaders, trucks, boats, campers, and solar systems.
- Durability and Weather Resistance: Water-resistant components withstand damp and dusty environments.
The True® 12v voltage meter gauge features
- waterproof & shockproof
- with ignition-activated relay,
- socket,
- dual battery wire,
- wire connectors for a complete install,
- designed for universal application
- Free Shipping and
- Full manufacturer warranty
The True® 12v dual battery volt meter is also ideal for CamperVan, 4×4, RV’s, Trucks, SUV’s, car and any automobiles with dual battery systems. It is also applicable as a marine dual battery voltage gauge.
Photos


Additional information
| Location | CANADA, US |
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Designed with UTV/ Side by Sides in mind. Although designed to work with the True® UTV-SBI-18 or 19L it will work in conjunction with any dual battery isolator or separator.



Jerry Locked –
It’s cool.
This dual voltage monitor is installed in my dual battery 2000 Silverado.
Everything went smoothly except that the LED lights are too bright at night.
Nicke Elliot –
Added a backup battery to the boat. I required a little indicator because there wasn’t much room on the instrument panel. This is a good fit and function. Because the higher powers the lights, connect the main battery to it (turning off the key) and the aux battery to the second battery. This manner, the dual battery gauge won’t always be illuminated.
Scott Ray –
Installing this dual volt gauge was simple and it functions flawlessly. Although I’m not sure how precise it is, it does match the Polaris RZR 1000’s readout. The LED flicker rate is my only complaint, and it can be a little annoying at night.
Edward Farmer –
Always know what your batteries look like before you head off shore
Fred Serrano –
So far so good
I implemented it in my fishing boat to assess voltage of starter battery.
So far, everything is going fine. When compared to a manual voltmeter, the measurement is precise. The screen is too bright and difficult to read, but it does the job.
Regie Bourne –
Both wiring and reading this are simple tasks. It monitors the primary and supplemental batteries on my Honda Pioneer. I would recommend it to the group.
Rhoniel Stone –
My truck Ford F250 has a dual battery setup, so I have to double-check the battery each time I turn it on. This is a great fit, but it has a strange 10-second “boot up” phase. Although it changes just every few seconds, which is not terrible, some people could find it perplexing.
Installing was not too long. Make sure it fits snugly by drilling a hole and then filing it out. I have it on a temporary switch.
John Fraiser –
Install this on my Land Rover’s dual battery setup. It remains in operation for a few months now with no problems.
Steve Lakewalker –
Excellent product. This is a highly effective and useful addition to my front center console, which I added. Definitely worth it
Nick Thomas –
The dual battery voltage gauge has an excellent refresh rate and is reliable. The only drawback is that in direct sunlight, it can be challenging to read the numerals.
Amanda Dude –
Excellent performance on the dual battery Honda Pioneer 1000-5 system! Both this device and the Nilight switch panel come highly recommended.
albert s –
Super simple to setup. I’m using it to keep an eye on my Land Cruiser’s two batteries. The only thing that bothers me is how bright it is. At night, this dual battery gauge completely illuminates my face.
Kelly William –
Although I can’t attest to its accuracy, the installation was quick and easy. When it’s extremely dark outside, it gets a little bright, but then, most of them do. In order to prevent the primary battery from running out, I upgraded my Honda Pioneer 1000-5 SXS with a the smart battery isolator and an additional auxiliary battery. The AUX battery powers all of my accessories, leaving the OEM main battery to handle solely the DCT transmission’s startup and operation. I can make sure both batteries are getting charged and working properly with this dual battery volt meter.