This voltmeter ammeter has a handy connection and a wide application. For example, it can be applied to monitoring storage battery, DC adjustable power supply, or voltage and current changing state of other device. Features - Color: Black. - Size: 4.80X2.90X2.20cm/1.89X1.14X0.86 inch. - Material: Plastic. - Applications: Suitable for automotive/electric car/motorcycles battery monitoring or other products voltage current measurement. - This voltmeter is 0.28 inch 3 digit high accuracy dual display, the display is bright and sharp. - When measuring current, the measured line provides power supply. Don't need an isolated power supply. - High accuracy voltage measurement with measuring line voltage drop compensation. - A good tool to monitor charging LI-ion batteries and electronics bench, etc. Specification - Voltage measuring range: 0-100V. - Current measuring range: 0-10A. - Working voltage: DC 4-30V. - Voltage error: 0.1%. - Current error: 1%. - Refresh rate: About 300ms/time. - Working current: lt;20mAh. - Operation temperature: -10-65. - Display color: Red and blue.