Voltage Converter -0.28 Inch 2-Wire 3.5-30v DC Led Display Voltmeter Digital Blue Highlights Generic Brand 0.28 Inch 2-Wire 3.5-30v DC Led Voltmeter Digital Blue Description: 2-wire voltmeter 3.5-30V DC. Light weight and highlight 0.28 inch LED nixie tube displays. Reverse connection protection technology to prevent short circuit. Adapt the 2-wire cable: red wire for positive pole and black wire for negative pole. High precision, low voltage activation and stable operation. Automatic decimal point adjustment. Specification: Display Color: Red/Blue/Green for your choice. Display mode: Three-digit numbers Testable voltage range: 3.5-30V Operating temperature: -10~65 Current consumption: less than 20mA Renewed speed: 500ms/time Size: 3.2x1.3x7cm / 1.25x0.51x2.75 inch Wire Length: 15 cm / 5.9 inch Package includes: 1 Piece LED Digital Voltmeter Note: The voltmeter will be broken when the working voltage exceeds 30V