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Parameters: Operating Voltage: DC3.5-150V Operating Current: Display: 0.52" LED green Dimension: 54 L*30 W * 27H mm Installing Size: 47.2*27.3 Testing Rate: >500mS/once Testing Accuracy: 1%(±1 digit) Protection for Reverse connection: yes Extreme working conditions: Minimum Operating Voltage: + 3.5V Maximum Working Voltage: + 150V Working Temperature: -10 ~ + 65 ℃ Working Humidity: 10 to 80% (non-condensing) Working Pressure: 80 ~ 106kPa Sun Exposure: no direct exposure Wiring Instructions: Red wire: + Black wire: - Package Includes: 1 X 2 Wires Waterproof Digital Voltmeter