Description

DC 4V-30V Mini 0.28″ Red LED Digital Voltmeter 2-Wire

The DC 4V-30V Mini Digital Voltmeter is a compact and easy-to-install voltage meter designed for monitoring DC voltage in batteries, vehicles, power supplies, and DIY electronic projects. Its bright 0.28-inch red LED display provides clear readings, even in low-light conditions.

With a simple 2-wire connection, reverse-polarity protection, and a compact panel-mount design, this voltmeter is a practical solution for checking voltage in 5V, 9V, 12V, 24V, and other DC systems within its supported range.

Key Features

• DC 4V-30V Measurement Range: Suitable for monitoring a wide range of low-voltage DC systems.
• Clear 0.28-Inch LED Display: Bright red digits provide easy-to-read voltage measurements.
• Simple 2-Wire Connection: Easy to connect directly to the power source being measured.
• Compact & Lightweight: Its small size makes it ideal for installations where space is limited.
• Reverse Polarity Protection: Helps protect the meter if the power wires are accidentally connected in reverse.
• 0.1V Resolution: Provides clear and useful voltage readings for everyday monitoring.
• Adjustable Accuracy: The rear potentiometer allows calibration and adjustment of the displayed voltage.
• Wide Applications: Suitable for cars, motorcycles, batteries, power supplies, control panels, and electronics projects.

Applications

This mini digital voltmeter is suitable for:

• Car and motorcycle battery monitoring
• 12V and 24V electrical systems
• DC power supplies
• Battery-powered projects
• Solar and DIY electronics projects
• Electrical control panels
• General-purpose voltage monitoring

Important Note

The input/detection voltage should remain within 4V to 30V DC. Do not apply more than 30V to the meter, as excessive voltage may damage the device.

Specifications

Specification	Details
Product Type	Mini Digital DC Voltmeter
Connection	2-Wire
Measurement Range	DC 4V-30V
Working Voltage	DC 4V-30V
Operating Current	Less than 20mA
Display	0.28-inch Red LED
Resolution	0.1V
Measuring Accuracy	Approximately ±0.3%
Measurement Rate	More than 200ms/time
Dimensions	33 × 10.7 × 8.2 mm
Installation Opening	28.5 × 10 mm
Reverse Connection Protection	Yes
Minimum Operating Voltage	4.0V DC
Maximum Operating Voltage	40V DC*
Operating Temperature	-10°C to +65°C
Operating Humidity	10% to 80% (non-condensing)
Working Pressure	80-106 kPa

*For safe voltage measurement, the specified 2-wire measurement range is 4V-30V DC.

Package Includes

• 1 × 0.28-inch Mini Digital Voltmeter

Wiring

• Red: Power supply positive (+)
• Black: Power supply negative (-) / Measurement negative