Feature: 1. High quality three-wire 4-30V DC voltmeter, practical and . 2. Sealed plastic waterproof shell with folding design, and convenient. 3. 0.36inch digital LED display, convenient to read data. 4. High , reverse . 5. Move the decimal point automatically. Specification: Features: High quality three-wire 4-30V DC voltmeter, practical and . Sealed plastic waterproof shell with folding design, and convenient. 0.36inch digital LED display, convenient to read data. High , reverse . Move the decimal point automatically. Specification: Material: Plastic Weight: 13g/0.5oz Operating voltage: 4-30V Test voltage: 0-100V Operating current: less than 20mA Mounting port: 23x14.5mm Measurement rate: 200ms/ time Working temperature: - 10 ℃ ~ 65 ℃ Measurement accuracy: 3% Working humidity: 10-80% (no condensation) Working pressure: 80~106kPa Display color: Red, Yellow, Green, Blue (Optional) Package List: 1* LED Digital Voltmeter 1* Cable