2.5V30V Digital Voltmeter DC Voltage Meter with 0.28 Inch Compact LED Display and Reverse Polarity Protection

2.5V30V Digital Voltmeter DC Voltage Meter with 0.28 Inch Compact LED Display and Reverse Polarity Protection Description

Compact 2.5V to 30V Digital Voltmeter with 0.28 Inch LED Display Overview This compact digital voltmeter provides a simple, reliable way to monitor DC voltages between 2.5 and 30 volts. Its twowire design uses the measured voltage as the power source, so no separate supply is required. Reverse polarity protection helps prevent damage from accidental miswiring. Key benefits Simple installation: twowire hookup with red to positive and black to negative. Reverse connection is protected. No external power needed: device powers itself from the measured circuit in the 2.5 to 30 V range. Clear, compact display: three 0.28 inch LED digits available in red, blue, green, yellow, or white. Practical measurement detail: shows two decimal places for voltages below 10 V and one decimal place at 10 V and above. Compact panel fit: small size makes it suitable for tight spaces and panel mounting. Main features and specifications Measuring range: 2.5 to 30 V DC. Safe pressure limit: can withstand up to 40 V; voltages above 40 V may cause damage. Wiring: twowire measurement; red to positive, black to negative; reverse connection protected. Power supply: no separate supply required; device works directly from the measured voltage. Input impedance: approximately 50 k ohm. Working current: less than 30 mA. Sampling rate: about 100 ms per update. Display: three 0.28 inch LED digit tubes; color options: red, blue, green, yellow, white. Cable length: 15 cm. Dimensions: 30 x 11.5 x 9 mm. Panel cutout: hole distance 26 mm, hole diameter 2.2 mm. Operating temperature: 10 to +65 degrees C. Operating humidity: 10 to 80 percent. Working pressure: 80 to 106 kPa. Practical applications Vehicle and battery monitoring: monitor 12 V and 24 V batteries, alternator output, and accessory circuits. Electronics projects and test benches: quick voltage checks for hobby circuits, power supplies, and prototype panels. Solar or small offgrid systems: onpanel monitoring of battery and regulator voltages within the specified range. Package contents 1 x Digital voltmeter Notes and precautions Minimum reliable measurement is 2.5 V. Avoid applying voltages above 40 V to prevent damage. Allow 1 to 3 cm tolerance for manual measurement of the unit if measuring the physical product. Actual display color may vary slightly from photos due to monitor differences.