Which is the best voltage meter gauge?

Finding the best voltage meter gauge suitable for your needs isnt easy. With hundreds of choices can distract you. Knowing whats bad and whats good can be something of a minefield. In this article, weve done the hard work for you.

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DROK Flat Plug AC 80-300V Voltage Panel Power Line Volt Test Monitor Gauge Meter AC 110V 220V Digital LCD Voltmeter DROK Flat Plug AC 80-300V Voltage Panel Power Line Volt Test Monitor Gauge Meter AC 110V 220V Digital LCD Voltmeter
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DROK Pocket Digital Multimeter USB, 5V 3A Gauge Mini OLED Monitor, Volt Amp Power Capacity Battery Tester, USB Charging Cable QC 2.0 Charger Troubleshooting Tool DROK Pocket Digital Multimeter USB, 5V 3A Gauge Mini OLED Monitor, Volt Amp Power Capacity Battery Tester, USB Charging Cable QC 2.0 Charger Troubleshooting Tool
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DROK 0.56 DROK 0.56" DC 3-30V Digital Voltmeter Voltage Tester Gauge Green Bright LED Display Two Wires Volt Meter for Solar Battery Monitor Car Motor Panel Mount
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bayite DC 6.5-100V 0-100A LCD Display Digital Current Voltage Power Energy Meter Multimeter Ammeter Voltmeter with 100A Current Shunt bayite DC 6.5-100V 0-100A LCD Display Digital Current Voltage Power Energy Meter Multimeter Ammeter Voltmeter with 100A Current Shunt
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Auto Power Plus Digital Display Voltage Meter Gauges DC 12V-24V Green Mini Led Voltmeter Panel For Car Motorcycle Jeep Trucks Auto Power Plus Digital Display Voltage Meter Gauges DC 12V-24V Green Mini Led Voltmeter Panel For Car Motorcycle Jeep Trucks
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DROK Car Cigarette Lighter Plug Voltmeter and USB Charging 2in1 Meter 12V/24V Voltage Gauge Volt Panel with Blue LED Display and 5V/2A USB Charger Interface DROK Car Cigarette Lighter Plug Voltmeter and USB Charging 2in1 Meter 12V/24V Voltage Gauge Volt Panel with Blue LED Display and 5V/2A USB Charger Interface
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IZTOSS Car Motorcycle Waterproof Blue LED Digital Panel Display Voltmeter Voltage Volt Meter Gauge DC 12V-24V IZTOSS Car Motorcycle Waterproof Blue LED Digital Panel Display Voltmeter Voltage Volt Meter Gauge DC 12V-24V
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MICTUNING LED Digital Double Voltmeter, Round Panel Voltage Monitor Blue for Car Pickup RV Truck Dual Battery Pack MICTUNING LED Digital Double Voltmeter, Round Panel Voltage Monitor Blue for Car Pickup RV Truck Dual Battery Pack
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IZTOSS Universal blue Cigarette Lighter Car usb port charger Digital LED Display Voltmeter Thermometer Auto Gauge 3in1 12V-24V Battery Voltage Tester Temperature Monitor Meter IZTOSS Universal blue Cigarette Lighter Car usb port charger Digital LED Display Voltmeter Thermometer Auto Gauge 3in1 12V-24V Battery Voltage Tester Temperature Monitor Meter
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Waterproof Monitor DC 4.5-150V 12/24/36/48V Volt Battery Meter Voltage Tester Automative Electric Cars Gauge Golf Cart E-Bike Bicycle Motorcycle Small Digital Voltmeter 0.56 Waterproof Monitor DC 4.5-150V 12/24/36/48V Volt Battery Meter Voltage Tester Automative Electric Cars Gauge Golf Cart E-Bike Bicycle Motorcycle Small Digital Voltmeter 0.56"LED Blue
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McIgIcM Digital Voltmeter Led,Red and Blue Digital Voltmeter Ammeter Dual Display Voltage DC 0-100V 10ADetector Current Meter Panel Amp Volt Gauge 0.28 McIgIcM Digital Voltmeter Led,Red and Blue Digital Voltmeter Ammeter Dual Display Voltage DC 0-100V 10ADetector Current Meter Panel Amp Volt Gauge 0.28"
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DROK 0.28 DROK 0.28"LED DC0-100V 10A Digital voltmeter Ammeter 2in1 Multimeter 12V/24V Voltage Amperage Meter Volt Amp Gauge Panel
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XCSOURCE Universal Digital Display Voltmeter Waterproof Voltage Meter Blue LED for DC 12V-24V Car Motorcycle Auto Truck BI313 XCSOURCE Universal Digital Display Voltmeter Waterproof Voltage Meter Blue LED for DC 12V-24V Car Motorcycle Auto Truck BI313
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Reviews

1. DROK Flat Plug AC 80-300V Voltage Panel Power Line Volt Test Monitor Gauge Meter AC 110V 220V Digital LCD Voltmeter

Feature

Doubles as a Voltage meter and as a Night light, great for immediate check on power health of devices
Connecting to the switch plug directly or any other kind of switch plug, simple and easy to use
LCD display with Blue backlight, easy for you to view even in Dim light
There is potentiometer inside the meter for accuracy adjustment

Description

Descriptions:
The module designed for measuring the ac voltage by connecting to the switch plug directly or the other kind of switch plug.
It is suitable for measuring the AC voltage in many place, such as office, factory, laboratory, household and so on.
You can use this item to monitor voltage of appliances; when this volt gauge show too high or too low voltage, you can choose
to close your appliances or equipments so as to prolong life of your appliances.

Parameters:
Measuring accuracy: +/-1.5%, +/- 2 word
Measuring range: AC 80-300V
Consume power:
Application:
You can use this item in RV as a way to view voltage to prevent issues with appliances
The product can show the voltage of power by connecting to the plug of AC 110V/220V
It is important for you to let the children away from the product
Don't use the product in a damp environment

Potentiometer adjustment:
Please use the phillips screwdriver to open the outer case of the volt meter;
later you can use phillips screwdriver in small size to adjust the potentiometer;
if display voltage is too high, then please adjust potentiometer in counter-clockwise
direction; if display voltage is too low, then please adjust potentiometer in
clockwise direction

Package Includes:
1x Digital Voltmeter

2. DROK Pocket Digital Multimeter USB, 5V 3A Gauge Mini OLED Monitor, Volt Amp Power Capacity Battery Tester, USB Charging Cable QC 2.0 Charger Troubleshooting Tool

Feature

SOPHISTICATED 4in1 MULTIMETER: DROK USB meter is a highly practical testing tool for measuring voltage, current, power, capacity via your phone/USB cable or other electric device. It is a portable and handy device for you to detect the quality of the power source/ USB wall charger/ USB car charger anywhere and anytime you want.
SIMPLE & EFFORTLESS ONE BUTTON OPERATION: One button on the back achieve all the operation of the USB multimeter such as screen rotation, data clearing. No complicated operation or setting needed. Can easily operate it, even you are not the electricity expert.
DETECTING, CHARGING WITHOUT HAMPERING EACH OTHER: Our multiple USB detector is not only a multimeter but also a USB charger supporting Qualcomm Quick Charge 2.0. It is compatible to all USB devices with 5V, 9V or 12V output and to devices such as iPhone, Samsung, Android, solar panel, etc. The USB signal line do not affect normal USB telecommunication.
MULTIFUNCTION: Our feature-rich pocket digital multimeter can be used for OVER-VOLTAGE & UNDER-VOLTAGE ALARM; CAPACITY AUTOMATIC STORAGE; SCREEN ROTATION. Using humanized DROK alignment tool, you can easily monitor the output voltage, current of your mobile cables, power use of Arduino board.
100% RISK-FREE SATISFACTION GUARANTEE- We offer you 100% risk-free satisfaction guarantee to let you buy with confidence. Besides, if you have any questions or confusions, please feel free to contact us, we are always here to assist you. So, ORDER NOW!! Don't hesitate to bring the Multi-functional DROK USB Digital Multimeter to your home.

Description

Not only a USB Digital Multimeter, But also a support QC 2.0 Fast Charging USB Charger.

PARAMETERS:

Screen material: 0.91OLED screen
Dimension: 64x22x11mm(L*W*H)
Voltage measurement range: DC 3.70-13V
Voltage accuracy: (0.3% + 1words)
Current measurement range: DC0.00-3.00A
Current accuracy: (0.5% + 2words)
Power measurement range: 0-30.00W
Capacitance measurement range: 0-99999mAh

MULTIPLE FUNCTIONS:

1. Screen rotation function: Press the button on the back, the display interface can rotate 180 degree.

2. Power-off storage function: When power off, the accumulated MAH will be automatically stored. And the accumulated MAH will twinkle next time when item is power on.
If the actual capacitance reaches 1mah next time when item power on, then the accumulated MAH last time will stop twinkling, and the screen display actual capacitance.

3. Over- & Under- voltage reminding: When the voltage is over 5.3V or less than 4.7V, there showing flashing arrow(^ 0r ), and will automatically disappear when voltage within 4.7V-5.3V.

4. Support QC2.0 technology, great for monitoring Qualcomm Quick Charge 2.0 chargers, power-banks and devices.

Are your USB charging cable or power bank suitable for your mobile device?
Hurry to get DROK USB 2.0 Digital Multimeter to find the answer!!

3. DROK 0.56" DC 3-30V Digital Voltmeter Voltage Tester Gauge Green Bright LED Display Two Wires Volt Meter for Solar Battery Monitor Car Motor Panel Mount

Feature

High accuracy: its Decimal point will automatically move, and it also has a tiny potentiometer to do finer adjustments
Easy to connect wires: it only has two wires, the red connects to positive and the black connects to negative
Safe to use: with reversed connection protection, it will NOT be burnt even when connected reversely, but the screen display nothing
Large screen and bright LED display, and it is well Made, the strong plastic case prevents it from easily damaged by outer force
It is perfect to monitor the condition of the battery, especially for solar projects, you can use it on your car, trailer, motor, etc

Description

Technical Parameters:
Dimension: 482922mm
Cutting size: 4627mm
Measuring voltage range: DC 3-30V
Maximum input: DC 30V (if the input voltage is higher than DC30V, the voltmeter will be burnt)
Minimum input: DC 3V (if the input voltage is lower than DC 3V, the value will be inaccurate or not displayed)
Measurement accuracy: Less than 10V, accurate to 0.01V; More than 10V, accurate to 0.1V (allowable tolerance: 1% +/- 1 word)
Display: 3 digit 0.56'' LED digital tube
Font Color: Green
Refresh rate: about 200mS
No need power supply
Consuming current: less than 20mA (generally 5-15mA)
Operating temperature: -10c-65c
Wire length: 20cm
Reverse connection protection: YES
Method of wiring:
Red wire: Positive
Black wire: Negative
Note:
Please don't use this meter in 24V battery because when the battery is full-charged, its voltage will be about 30V
(the max input volt for this meter), and we don't suggest you use it in max volt of 30V.
Package Includes:
1 0.56'' Voltmeter

4. bayite DC 6.5-100V 0-100A LCD Display Digital Current Voltage Power Energy Meter Multimeter Ammeter Voltmeter with 100A Current Shunt

Feature

Voltage test range: DC 6.5~100V; Current test range: 0~100A
Store energy data when power off(can be reset to 0). The blue backlight can be turned on/off manually
With overload alarm function(If active power is larger than threshold, backlight and power will flash)
Large-screen LCD (display voltage, current, active power, energy at the same time)
Note: only display and shunt are included. It doesn't include any wire or accessories

Description


Main Specifications:

Working voltage: DC 6.5 ~ 100V
Measuring Accuracy: 1%
Power Consumption: 0.2W
Measurement speed: 2 times/s
Store Energy data when power off. Can be reset to 0.
The blue backlight can be turned on/off manually

Test Range and Display format:

1.Active Power test range: 0~10kW
2.Energy test range: 0~9999kWh
3.Voltage test range: DC 6.5~100V
4.Current test range: 0~ 100A

Precautions

1. This module is only suitable for 6.5~100V DC power.
2. Applied load should not exceed the rated power.
3. Wiring order cannot be wrong.
4. This module is suitable for indoor, please do not use outdoor.

Packing including:

1x DC 6.5-100V 100A Power Multimeter

5. Auto Power Plus Digital Display Voltage Meter Gauges DC 12V-24V Green Mini Led Voltmeter Panel For Car Motorcycle Jeep Trucks

Feature

HIGH-PRECISION - The measurement range of voltmeter is 3-30V, measuring error less than 0.1, perfect for you to grasp the state of the battery voltage at real time!
DIGITAL DISPLAY - 3 bit green LED digital tube helps easier and clearly read the current precise working volts of volt meter, better to notice you to charge or replace your battery!
LONGLIFESPAN - Design with superior black matte anti-flame retardant ABS housing, certified by CE & IP66, waterproof, high current resistance, durable with long lifespan!
WIDELY USED - Provide with wiring terminals, plug and play, easy to install, suitable for DC 12-24V Cars / Trucks / Boats / ATVs / UTVs / Camper / Caravans / Trailer, etc.
WHAT YOU GET -Green Led digital voltmeter * 1, wiring terminal * 2. (NOTICE: the maximum input voltage can not exceed 30V, otherwise there is the risk of burning).

Description

Attention!!
- When started,the normal voltage is 13.5V-14.5V. It is abnormal if the voltage is too high or too low. It is recommended to check and repair it at the repair shop.
- Note that the maximum input voltage can not exceed 30V, otherwise there is the risk of burning.

Fixed Method:
First use the opener and open a hole about 3cm in diameter, then put the watch in the hole and screw it down.

Product Parameters:
- Product Name: Mini high precision digital display voltmeter
- Material: Upgrade ABS material housing
- Display Mode: Digital LED display
- Led Color: Green
- Weight: 15g
- Pin Width : 6.3MM
- Size: 3.66 cm in diameter, thread diameter 2.90cm, overall thickness of 1.52 cm
- Measuring Range: 6-30V
- Measurement Error : <1%
- Mounting Hole Diameter: 2.90cm
- Operating Voltage: DC 12V-24V (AC unavailable)
- Interface Type: Positive and negative pole connection
- Application: 12-24V cars, motorcycles, marine ,boat ,etc.

Product Characteristics:
- Measuring DC voltage, with against reverse and short circuit protection.

Product Function:
- Timely monitoring battery voltage, effectively extend and protect the life of battery and engine.

6. DROK Car Cigarette Lighter Plug Voltmeter and USB Charging 2in1 Meter 12V/24V Voltage Gauge Volt Panel with Blue LED Display and 5V/2A USB Charger Interface

Feature

12V 24V Voltage Monitor and USB Charger 2 in 1, power mode is cigarette lighter style.
Function 1: Car battery voltage monitoring, for 12V cars, SUV, 24V trucks, buses.
Function 2: USB charger, output voltage is 5.0-5.1V, can charge 0-2.1A cell phones, digital cameras, tablet pc and etc.
High efficient IC design, Safely protect devices and charger from overheated.
Compatible with Apple iPhone iPad, Samsung Galaxy Note or other Android devices.

Description

Features:
Size:75mm x 40mm
Power mode: cigarette lighter style
Voltage measuring range: DC 8-40V (DC12V/24V Universal)
Display: 3 bits, Blue LED digital tube (if need RED LED, please check the item B00EZ031KC)
Voltage error: 0.1-0.2V
USB Output Voltage: DC 5.0-5.1V
USB Output Current: 0-2.1A
Function 1: Car battery voltage monitoring, for 12V cars, SUV, 24V trucks, buses.
Function 2: USB charger, can charge 0-2.1A cell phones, digital cameras, tablet computers and etc.

Applicable Type: Support Apple/Android, suitable for IPhone/Ipad/Ipod

Note: May not compatible with some Samsung tablets, you can use a Samsung adapter.

Package includes:
1x 2in1 Digital Voltmeter and USB Charger

7. IZTOSS Car Motorcycle Waterproof Blue LED Digital Panel Display Voltmeter Voltage Volt Meter Gauge DC 12V-24V

Feature

Universal fits most DC 12-24V Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc.
Range:5V-30V.Waterproof design, mounts in a 1-1/8" hole in panels up, 0.25" thick, a nylon retaining nut holds the meter in place. Twist-and-Lock system. Mini size and easy to install, great for checking Voltage.
The indicator in the middle will twinkle to alarm when the voltage is more than 15V for DC 12V battery ,it will twinkle to alarm when the voltage is more than 30V for DC 24V battery.
Used to monitor the storage-battery voltage, with reverse connection protection. Timely grasp the state of your battery between full charged and discharged.
Voltage measurement purposes can also be used for other products.include 2 short wires for installation

Description

Features:
Universal fits most DC 12-24V Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc.
Twist-and-Lock system. Mini size and easy to install, great for checking Voltage.
3-digits Display, LED digital tube, lamp display is Blue.
Waterproof design, mounts in a 1-1/8" hole in panels up, 0.25" thick, a nylon retaining nut holds
the meter in place.
Used to monitor the storage-battery voltage, with reverse connection protection.
Timely grasp the state of your battery between full charged and discharged.
Voltage measurement purposes can also be used for other products.
Specifications:
Eco-friendly Meterial: Plastic
Color: Transparent
Voltage Measuring range: 5 - 30V (Blue digital display)
Battery Measuring range: 0 - 65A (LED multi-color, Green---full battery; Orange---half-full battery;
Red---low battery)
Outer diameter: 36mm / 1.4"
Thread diameter: 29mm / 1.1"
Length: 52 mm / 2.0"
Interface Type: Anode and cathode
Application: Universal for all Cars, motorcycles and other universal models.
Package includes:
1 x LED DC Voltmeter
2 x Insulated Terminals

8. MICTUNING LED Digital Double Voltmeter, Round Panel Voltage Monitor Blue for Car Pickup RV Truck Dual Battery Pack

Feature

MICTUNING [Exclusive] Round Double Voltmeter, real time monitoring 2 battery packs of vehicles, remind you of charge or replacement in time, better avoid emergent dead battery at starting car engine!
Embedded in 3-bit Blue LED digital display, Clearly shows you the current precise readings of working volts, better helps you to early notice your car voltage condition
Super large input of up to DC 60V with Over-current Over-volt and Short Circuit Protection, well protects the whole circuit, fits for most 12-24V Car Motorcycle ATV UTV RV Vehicles and Marine Boat
Made of Eco-friendly & flame retardant durable ABS plastic and good conductivity pins with black matte surface treatment, wear and tear resistant for long lasting durability
Panel Flush Mount and Easy to Install, drill size of 1.15" diameter, with Twist & Lock fastener for stable mounting, Fits to almost all panel locations you desired!

Description

LED Digital Dual Voltmeter - Clearly show you precise volts!
- Feel upset when you start the vehicle with dead battery?
- No idea when to charge or replace your battery?
- Have a difficulty to select a voltmeter?...

MICTUNING NEW version of LED Digital Round Double Voltmeter is the Bright Choice, for Safe and Fun! Input large volts of DC 10-60V, it is suitable for most 12-24V vehicles with 2 battery pack,
one for main battery and the other for auxiliary one. With dual led digital display, specially designed to check up real-time voltage for 2 electrical appliances at the same time, which clearly
shows you the voltage readings and helps you to better monitor car voltage condition. Say Goodbye to Exhausted Battery Before Each Drive!

Reliable Safety Protection
Built in over current, over voltage and short circuit protection, it well protects the whole circuit. While made of eco-friendly and flame retardant ABS plastic shell and good conductivity
connecting pins, it is super sturdy and lasts for a long long time.

Surface Mount, Breeze Install
Molded in compact round shell with black matte surface treatment and drill size of 1.15" diameter to fit for most almost all dashboard panels, this double voltmeter is universal fitted to most RVs, Campers, Pickups, Vans, Trucks, Trailers, Marine Boats, etc. Get One for Your Vehicle, Well Know of Car!

Package List:
1 x LED Digital Round Double Voltmeter

9. IZTOSS Universal blue Cigarette Lighter Car usb port charger Digital LED Display Voltmeter Thermometer Auto Gauge 3in1 12V-24V Battery Voltage Tester Temperature Monitor Meter

Feature

USB Output Voltage: DC 5.0-5.1V; USB Output Current: 0-2.1A, built-in fuse
Voltage measuring range: DC 8-40V, DC12V/24V; Temperature measuring range: -10 ~ 80
Function 1 : Car battery voltage monitoring, 12V cars/SUV, 24V trucks/buses
Function 2 : Universal USB charger, cell phones, digital cameras, tablet PC, for Apple/Android ;
Function 3 : In-car temperature measurement, -10 ~ 80

Description

Features:
USB Output Voltage: DC 5.0-5.1V
USB Output Current: 0-2.1A, built-in fuse
Voltage measuring range: DC 8-40V, DC12V/24V
Temperature measuring range: -10 ~ 80
Power mode: cigarette socket
Display color : Red / Blue/ green
Display mode: volt and temp alternate display in 10 seconds
Size:75mm x 40mm
Function 1 : Car battery voltage monitoring: 12V
cars/SUV, 24V trucks/buses
Function 2 : Universal USB charger, cell phones, digital cameras, tablet PC etc, suitable for Apple/Android
Function 3 : In-car temperature measurement: -10 ~ 80
Package include:
1x Car Charger Voltmeter Thermometer 3in1

10. Waterproof Monitor DC 4.5-150V 12/24/36/48V Volt Battery Meter Voltage Tester Automative Electric Cars Gauge Golf Cart E-Bike Bicycle Motorcycle Small Digital Voltmeter 0.56"LED Blue

Feature

Measure voltage :DC 4.5-150V(Power Supply No Neede)
Dimension:48*29*22mm
Display color: Blue
Waterproof dust-proof, which is suitable for 24V 48V 72V 96V golf cart and other electronic motor device

Description

Description:
Measure voltage :DC 4.5-150V(Power Supply No Neede)
Three 0.56'' LED digital tube
Dimension:48*29*22mm
Display color: Blue
Waterproof dust-proof, which is suitable for 24V 48V 72V 96V golf cart and other electronic motor device
Refresh rate: about 200mS / times
Resolution: 1% +1 digit
Cutting Size: 47*27mm

Package:
1*digital tube

11. McIgIcM Digital Voltmeter Led,Red and Blue Digital Voltmeter Ammeter Dual Display Voltage DC 0-100V 10ADetector Current Meter Panel Amp Volt Gauge 0.28"

Feature

Display: 0.28" LED digital
Operating voltage: DC 4.5 ~ 30V; Size: 48mm x 29mm x 26mm
Measure voltage: DC 0 ~ 100V;Minimum resolution (V): 0.1V;
Operating Current: <20mA;Minimum resolution (A): 0.01A;Measure current: 10A
Operating Humidity: 10 to 80% (non-condensing);Operating temperature: -10 to 65c

Description

Welcome to our Amazon store McIgIcMfor more choice and more discount.

We make professional person test the product to ensure theirs quality.

If you want a big order please contact with us and we will offer our best service.

12. DROK 0.28"LED DC0-100V 10A Digital voltmeter Ammeter 2in1 Multimeter 12V/24V Voltage Amperage Meter Volt Amp Gauge Panel

Feature

With small sized x 29 x 21 mm ), wide measuring range(dc 0-100v; 0-10A) and high accuracy percent ( 1 digit))
Display Voltage and current simultaneously in different colors, red for Voltage, Blue for current (the current is Measured in the negative rail)
Require external power supply; with reversed connection protection
Ground wire of testing end and power supply terminal is the same wire; quick refresh of about 500 MS/time
With built-in shunt, has Voltage and current calibration potentiometers

Description

Features:
Operating voltage:DC 4.5 - 30V
Measure voltage: DC 0 - 100V
Minimum resolution(V): 0.1V
Measure current :10A (measure directly,built-in shunt)
Minimum resolution(A): 0.01A
Operating current: <20mA Display color: Red and Blue (two-color display)
Dimensions: 48 x 29 x 21mm
Mounting cutout: 45.5 x 26.5mm
Refresh rate: about 500mS / times
Measure accuracy: 1% ( 1 digit)
Operating temperature: -10 to 65 c
Operating Humidity: 10 to 80% (non-condensing)
Applications:Suitable for automotive/electric cars/motorcycles battery monitoring or other products voltage current measurement

Wiring:
Black line (thin): vacant or buck circuit (module) negative
Red line (thin): power supply+
Black line (thick): COM, common measuring
Red line (thick): PW+, measuring terminal voltage input positive
Yellow line (thick): IN+, current input+
(Please refer to the wiring diagrams for more details)

Notice:
The voltage between the thin red and thin black lines must be within DC 4.5-30V
The ammeter can only be connected to the negative of the device under test
10A below ammeter (include 10A), built-in shunt, does not require external shunt
When the black thin line vacant, it is better to use insulating tape around the exposed part of the wire, to prevent short circuits
If just be used as a voltmeter, it is recommended that the yellow line and the black line were connected together, to prevent the ammeter digital flashing

Package include:
1x Digital Volt Ampere Meter

13. XCSOURCE Universal Digital Display Voltmeter Waterproof Voltage Meter Blue LED for DC 12V-24V Car Motorcycle Auto Truck BI313

Feature

Universal for: Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc.
Twist-and-Lock system. Display: 3-bits, LED digital tube, lamp display is Blue / Green.
It works for 12V-24V. Mini size and easy to install,work great for checking Voltage.
Mounts in a 1-1/8" hole in panels up, 0.25" thick, a nylon retaining nut holds the meter in place.
Used to monitor the storage-battery voltage, with reverse connection protection function, line will not be burnt.

Description

Features:
Universal for: Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc.
Twist-and-Lock system. Display: 3-bits, LED digital tube, lamp display is Blue.
It works for 12V-24V. Mini size and easy to install,work great for checking Voltage.
Mounts in a 1-1/8" hole in panels up, 0.25" thick, a nylon retaining nut holds the meter in place.
The state of your battery between full charged and discharged.
The meter has easy to read LED segments and connect to your 12 volt system.
Used to monitor the storage-battery voltage, with reverse connection protection function, line will not be burnt.
Timely grasp the state of battery voltage, voltage measurement purposes can also be used for other products.

Specifications:
Waterproof
Color: Black
LED Display: Blue
Measure Voltage: 6 - 30V
Size: 1.4" x 1.4" x 0.5"
Interface Type: Anode and cathode
Eco-friendly Meterial: Acrylic
Application: Universal for all Cars, motorcycles and other universal models.

Package includes:
1 x LED DC Voltmeter
2 x Insulated Terminals

Conclusion

All above are our suggestions for voltage meter gauge. This might not suit you, so we prefer that you read all detail information also customer reviews to choose yours. Please also help to share your experience when using voltage meter gauge with us by comment in this post. Thank you!