DC5-30V 0.28Inch LED Digital Voltmeter

Key Features

• Digital LED Display — The 0.28-inch LED display shows readings in red, blue, green or yellow.
• Two-Wire Connection — It has two wires for easy connection to the inside line of a car, battery car or motorcycle.
• Reverse Protection — The reverse protection function helps keep the line from burning, with a working voltage of DC2.4~40V.
• Two-Digit Readings — Below 10V it shows two digits after the decimal point, and above 10V it shows one.
• Compact Size — It measures 0.28 inches and takes up very little space, so it suits tight spots.

Product Specifications

• Dimensions: 0.28Inch
• Display mode: 0.28-inch LED, red, blue, green or yellow
• Range: 2.5-40V (red), 2.6-40V (yellow), 2.6-40V (green), 3.2-40V (blue)
• Working voltage: DC2.4~40V (with reverse protection function)
• Low operating voltage: +2.4V
• Working current: <30mA
• Measurement rate: ≥200mS/time
• Measurement accuracy: 3‰
• Operating temperature: -10 ~ +65℃
• Working humidity: 10 ~ 80% (no condensation)
• Working pressure: 80 ~ 106kPa
• Packaging: 1pc

What It Is / How It Works

This is a 0.28-inch LED digital voltmeter for measuring DC voltage. Digital voltmeters like this show the reading on a small LED display, so there is no needle to misread.

Who It's For / Use Cases

Voltmeters of this kind suit people who check DC voltage on 18650 batteries, phone lithium batteries, nickel-metal hydride battery packs, motorcycles and cars. They also fit hobbyists and students working on DC power supplies, electric vehicles and teaching projects.

How to Use / Care

1. Use it to measure the voltage of 18650 batteries.
2. Use it on mobile phone lithium batteries, nickel-metal hydride battery packs and battery packs.
3. Use it to measure the voltage of motorcycles and automobiles.
4. Use it for DC voltage measurement in DC power supplies, electric vehicles, scientific research and teaching.
5. Do not apply an input voltage above 40V, as this risks burning the meter.

How to Choose

Start with the voltage you need to read. The working voltage is DC2.4~40V, so match your battery or DC circuit to that span. Keep the input under 40V.

Choose the display colour you prefer, since it is shown in red, blue, green or yellow. If you test very low batteries, note that the display dims below 3.0V while readings stay correct.

Frequently Asked Questions

What voltage range does it read?
The working voltage is DC2.4~40V with reverse protection.

How many decimal places does the display show?
Below 10V it shows two digits after the decimal point. Above 10V it shows one digit after the decimal point.

What happens when the battery voltage is low?
When the voltage falls below 3.0V, the display brightness dims, but the measurement stays correct.

What conditions does it work in?
It works from -10 to +65℃ at 10 to 80% humidity with no condensation, and it should not be exposed to direct sunlight.

How many come in a pack?
Each pack contains one piece.