The Mini Digital LED Voltmeter is a compact DC voltage display module designed for monitoring battery voltage, power supply output and other DC circuits. BDTronics offers this small panel voltmeter for electronics projects, solar systems, battery packs, DIY power supplies, automotive applications and other low-voltage DC equipment.

This digital voltage meter uses a bright three-digit 0.28-inch LED display and measures DC voltage directly from the circuit being monitored. It does not require a separate power supply because the measured voltage also powers the meter. Its extremely compact 30 × 12 × 8.5mm body makes it suitable for installation in space-constrained projects.

The module provides a DC measurement range of approximately 3.50V to 30V with an accuracy of ±(1% + 2 digits). The red and black wires are used for both powering the meter and measuring the input voltage, making installation simple for battery voltage monitoring and DIY electronics projects.

Features:

• Mini digital DC voltmeter module

• Bright three-digit LED display

• 0.28-inch LED display

• DC voltage measurement from 3.50V to 30V

• No separate power supply required

• Uses the measured voltage as its operating power

• Compact 30 × 12 × 8.5mm body

• Approximately 10cm lead wires

• Fast voltage display update

• Suitable for battery voltage monitoring

• Easy installation in DIY electronics projects

• Suitable for solar, automotive and DC power applications

• Low-profile design for space-constrained installations

Specifications:

• Product Type: Mini Digital LED Voltmeter

• Display Type: 3-digit LED

• Display Size: 0.28 inch

• Measurement Range: DC 3.50–30V

• Minimum Input Voltage: 3.50V

• Maximum Input Voltage: 30V

• Accuracy: ±(1% + 2 digits)

• Display Update Rate: Approximately 500ms

• Operating Temperature: -10°C to +65°C

• Module Dimensions: 30 × 12 × 8.5mm

• Mounting Hole Distance: 26mm

• Lead Wire Length: Approximately 10cm

• Power Method: Self-powered from measured voltage

• Display Color: Red, as shown in the product image

Wiring:

• Red Wire: Positive (+) power and voltage measurement input

• Black Wire: Negative (-) power and voltage measurement input

Connect the red wire to the positive terminal and the black wire to the negative terminal of the DC voltage source being measured. Because this is a self-powered voltmeter, no additional power supply connection is required.

Applications:

This mini digital voltmeter is suitable for 12V battery monitoring, 24V battery systems, solar power projects, DC power supplies, DIY electronics, Arduino projects, automotive electronics, motorcycle electrical systems, portable power equipment, battery chargers and inverter projects.

Its compact size makes it particularly useful where a conventional panel meter would occupy too much space. It can be installed directly into a project enclosure, control panel or custom electronics housing.

Important Notes:

• Designed for DC voltage measurement only.

• Do not exceed the maximum specified input voltage.

• Ensure correct polarity when connecting the red and black wires.

• The module is powered directly from the voltage being measured.

• The specified measurement range is approximately 3.50–30V DC.

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