Features Digital display, display current and voltage at the same time, clear and easy to read. A variety of range specifications can be selected to meet the needs of various working scenarios. High accuracy, sensitive response, fast recognition, with stable and excellent performance. Have humanized design, simple operation, easy to install, convenient to use and operate. Small in size and light in weight, convenient to carry and use at any time, very convenient and practical. Specification:Item Type: Digital Voltmeter Ammeter Material: PCB Measuring Range: 0V-100V Test Range: 0-10A 0-50A 0-100A  Power Supply Range: DC4-30V Voltage Error: ±0.1% Current Error: ±1% External Separator Specifications: 75 milliohms Working Current: <20mA Refresh Speed: About 300ms once Display Mode: Double three-digit 0.28 in LED digital tube Display Color: Red and blue Purpose: Used to display voltage and current readings Applicable Scenarios: Electronic equipment, circuit protection, wiring, maintenance, etc. Package List:1 x Digital Voltmeter Ammeter 2 x Guide Line Note:1. The power supply voltage of the meter must be 4‑30v. If it exceeds 30V, independent power supply is required. Please connect according to the diagram. The four points of the shunt cannot be changed at will.2. The digital display meter and shunt are used together, 1A, 10A cannot be used with 50A, 100A shunts, please know.3. Regardless of whether the measured current is less than 10A, the meter with a range of 50A or 100A must be connected to a shunt to measure the current! Otherwise, the meter head will be burnt.4. Please note that the new type and old type of this product will be sent randomly,and make sure you will not mind before ordering. Package List 1 x Digital Voltmeter Ammeter 2 x Guide Line