0.28″ 0–100V Three-Wire DC Digital Voltmeter – Red LED Display
This compact digital voltmeter with a bright 0.28-inch red LED display is designed to provide accurate and real-time voltage readings for a wide range of DC applications. With a simple three-wire connection, setup is quick and straightforward—ideal for hobbyists, automotive diagnostics, DIY electronics, and more.
Thanks to its built-in reverse polarity protection, accidental wiring mistakes won’t damage the device. The voltmeter automatically adjusts the decimal point for better readability:
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Below 10V: displays two decimal places (e.g., 9.58V)
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Above 10V: displays one decimal place (e.g., 48.7V)
It supports dual-source measurements, meaning it can be powered by one source while measuring another, as long as both share a common ground.
With a measurement range of 0V to 100V, this voltmeter is perfect for monitoring battery levels (in cars, motorcycles, etc.), power supplies, solar systems, or any low-voltage DC setup. For optimal safety and longevity, avoid continuous use above 30V without proper filtering, as sudden voltage spikes can cause permanent damage.
Wiring Guide:
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Red Wire: +V (Power Supply Positive)
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Black Wire: GND (Common Ground for Power Supply and Measured Source)
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Yellow/White Wire: +V (Voltage Source to Measure)
Case 1: If measuring the same source that powers the voltmeter, connect all three wires to the same source.
Case 2: If measuring another voltage source, ensure both sources share a common ground.
⚠️ Note: Display weight and dimensions may vary ±2%.
Features:
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Ultra-compact and lightweight design
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Easy 3-wire installation
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Wide input voltage range: 0V to 100V DC
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Working voltage: 5V to 24V DC
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Auto decimal point adjustment for enhanced accuracy
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Bright red LED for clear visibility
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Reverse polarity protection
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Ideal for automotive, DIY electronics, and battery monitoring
Package Includes:
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1 x 0.28″ 0–100V Three-Wire DC Digital Voltmeter – Red LED