Digital Voltmeter Display Red LED 0.56 inch – 2 Wire 4.5-30VDC
The digital voltmeter is a compact DC voltage meter built around a 0.56-inch red LED display, housed in a small rectangular panel-mount enclosure. It is designed primarily for monitoring low-voltage DC systems, and is powered directly from the measured voltage (no separate supply required). The meter uses a simple two-wire connection positive and negative to simultaneously supply power and measure the voltage. This minimal wiring design reduces complexity and makes installation straightforward for a wide range of electrical systems, from automotive to battery-powered projects.
Once connected, the device continuously reads the DC voltage in the 4.5 V to 30 V range and displays it in real time on the LED screen. For voltages below 10 V, it shows two decimal places; above 10 V, it typically shows one decimal place enabling reasonable precision over its measurement span. The display automatically updates at a regular refresh rate (on the order of a few hundred milliseconds), giving the user near real-time feedback of voltage changes. Its compact dimensions and panel-mount form factor let it integrate easily into enclosures, dashboards, battery boxes, or power supply housings.
Because of its simplicity and self-powered nature, the voltmeter is well suited for battery monitoring (e.g. automotive batteries, solar battery banks), DIY electronics projects, and any system requiring a continuous DC voltage readout without bulky instrumentation. The red LED display is bright and easy to read even in low light. Its small size, low power consumption, and minimal wiring make it an accessible, quick-to-deploy tool for hobbyists, engineers, or technicians needing a compact voltage indicator.
Features:
- The wiring of this voltmeter is simple, only two wires need to be connected, the red wire is connected to the positive, and the black wire is connected to the negative. There is reverse connection protection in the meter, and the reverse connection does not burn.
- This voltmeter does not require an external working power supply, it can work directly with the measured voltage, and the working voltage range is as wide as 4.5-30V.
- In order to achieve the best measurement accuracy, the voltmeter will automatically move the position of the decimal point according to the difference of the measured voltage. Measuring voltage below 10V
- At the time, two digits are displayed after the decimal point; when measuring a voltage above 10V, one digit is displayed after the decimal point.
- This voltmeter can be used to monitor the battery voltage of motorcycles, automobiles, etc., and grasp the battery status in time. It can also be used for other voltage measurement purposes.
Specifications
| Parameter | Value |
|---|---|
| Dimensions: | Length 48 mm × Width 29 mm × Depth 22 mm |
| Hole Size: | 45 × 25 mm |
| Lead Length: | 20 cm |
| Measuring Range: | 4.5 – 30 VDC |
| Low Input Limit: | DC 4.5 V (below this, measurement becomes inaccurate or may not display) |
| High Input Limit: | DC 30 V (exceeding may cause damage) |
| Allowable Error: | 0.01 V resolution below 10 V, 0.1 V above 10 V, ±1% (±1 digit) |
| Display Type: | 3-digit 0.56″ LED digital tube |
| Display Color: | Red |
| Refresh Rate: | ~200 ms per update |
| Current Consumption: | < 20 mA (typically 5–15 mA) |
| Operating Temperature: | –10°C to +65°C |
Applications:
- Battery voltage monitoring (cars, motorcycles, solar systems).
- DC power supply voltage display.
- DIY electronics and hobbyist projects.
- Embedded systems and panel-mounted voltage monitoring.
Package Contents:
- 1x Digital Voltmeter Display Red LED 0.56 inch – 2 Wire 4.5-30VDC
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