Mini 0.28 inch 3-Wire Red LED Digital Voltmeter (DC 0-100V)

Monitor your power with absolute precision using our Mini 0.28 inch 3-Wire Red LED Digital Voltmeter. Designed for maximum versatility in tight spaces, this ultra-compact voltage display panel reads from DC 0V to 100V with crisp, high-brightness red visibility.

Unlike standard 2-wire meters that shut off at low voltages, the advanced 3-wire configuration utilizes an independent power line. This enables the meter to measure voltage all the way down to 0V absolute zero—making it the ultimate diagnostic tool for low-voltage circuits, battery cells, and custom electronics.

Featuring built-in reverse polarity protection and a smart, self-adjusting decimal point for maximum resolution, it delivers professional-grade accuracy in a microscopic footprint.

Key Specifications

• Measurement Range: DC 0.00V – 100.0V
• Operating Voltage (Power Input): DC 4.0V – 30.0V (Red wire)
• Display Type: Three 0.28-inch digital LED tubes
• Display Color: High-visibility Red
• Measurement Accuracy: ±1% (Auto-shifting decimal point: 2 decimals below 10V, 1 decimal above 10V)
• Refresh Rate: Approximately 300ms
• Input Impedance: >100KΩ
• Operating Current: <20mA (Ultra-low consumption)
• Lead Wire Length: 15cm (approx. 6 inches)
• Safety Feature: Reverse polarity burnout protection

Wiring Guide & Functionality

1. Independent Power Source Mode (Measures 0V – 100V)

• Red Wire (VCC): Connects to external power supply (+) [DC 4V – 30V]
• Black Wire (GND): Connects to system ground (-) [Common Negative]
• White/Yellow Wire (VIN): Connects to the target voltage source (+) [DC 0V – 100V]

2. Self-Powered Mode (Measures 4V – 30V)

• Red & White/Yellow Wires: Tied together and connected to the source (+)
• Black Wire: Connected to the source (-)

Best Used For

• Lithium Battery Packs: Real-time monitoring of custom e-bike, drone, and power tool batteries.
• Automotive Tech: Compact dash addition for cars, motorcycles, marine boats, and RVs.
• DIY Lab Benches: Easily add an affordable digital readout to any custom bench power supply.
• Solar Power Systems: Keep visual track of low-voltage solar panels and charge controller outputs.

Package Includes

• 1 x Mini 0.28" 3-Wire Red LED Digital Voltmeter (DC 0-100V)

Note: Image is for representation purpose only.