Description: Display voltage and current simultaneously in different colors, red for voltage, blue for current. (the current is measured in the negative rail). Require external power; With reverse connection protection. Ground wire of testing end and power supply terminal is the same wire; quick refresh of about 500 ms/time Characteristics: Dual-color digital display (red for voltage and blue for current), bright LED, easy to read Voltage measurement range: DC0-100V; current measuring range: 0-100a (comma move automatically) Flexible power supply, can provide both isolated and non-isolated power to turn on the meter With reverse connection protection to avoid burning for reverse connection Ground wire of testing end and power supply terminal is the same wire; quick refresh Specification: Material: plastic Color: red, blue Size: 48×29×21mm Working voltage: 4.5-30V DC Working current: ≤ 20mA Display: 0.28" Two color blue and red Measuring range: DC 0-100V 0-10A Minimum Resolution (V): 0.1V Refresh rate: ≥ 100mS/times Measurement accuracy: 1% (± 1 digit) Minimum resolution (A): 0.01A Operating temperature: -15 to 70°c Working pressure: 80 to 106 kPa Note: The maximum input voltage cannot exceed 30V, otherwise there is a danger of burning Package includes: 1x Digital Voltmeter Ammeter Supply voltage: 4.5 - 30V (wide range) Voltage measurement range: 0-100V Current measurement range: 0-10A If you have any question, please contact us, we will reply you within 24 hours. Display screen: 0.28 inch LED