Features: High accuracy dual- display, the display is bright and for sharp. M520 is a voltage and current power measuring instrument, which can only measure and display the voltage, current and power of the circuit under test. It can be adjusted by adjustable resistance to fine tune the display value. It does not have the function of lifting voltage or limiting current regulation, so it does not affect the actual voltage and current of the circuit under test. Do not use more than 20V high voltage work, otherwise it is easy to cause the product overvoltage damage. 10A range products come with shunt resistance, direct current measurement test section will appear short circuit, as long as the instrument in series after the load can be used normally. Specifications: Material: ABS Operating voltage: 5~12V Measuring range: voltage measurement range 0-100V, 10V- below display mode 0.0V, voltage 0.1V jump, error range 1V Current measurement range 0~10V-, current 0.3A jump, error 3% Shunt resistance: on-board shunt resistance without external shunt. Shunt resistance and current test line in parallel, no- load test will short circuit alarm, when using the thick red- line string to the load negative electrode normal use. Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Digital Ammeter Voltmeter