Features: 3 standard for your option: 0-10A/0-50A/0-100A. High accuracy dual- display, the display is bright and for sharp. M-430 is a voltage and current power measuring instrument, which can only measure and display the voltage, current and power of the loop under test. It can be adjusted by adjustable resistance to fine tune the display value. It does not have the function of voltage lifting or current limiting, so it does not affect the actual voltage and current of the loop under test. Do not use more than 30V 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. Package Includes: 1x 1x Digital Ammeter Voltmeter Specifications: Material: Plastic Standard: 0-10A/0-50A/0-100A(optional) Operating voltage: The operating voltage of the instrument ranges from DC4 to 30V. It is recommended that the voltage connected to the fine red and black lines should not exceed 30V. It is recommended that 12V supply power. Voltage range: voltage measurement range 0~100V,10V- below display mode 0.0V, voltage 0.2V jump, error range 1V Current range range: 10A: Current measurement range of 0~10A, current 0.03A- jump, error 0.1A 50A: Current measurement range of 0~50A, current 0.03A- jump, error 0.5A 100A: Current measurement range is 0~100A, current 0.03A- jump, error 1A Function: Voltage fine-tuning, current fine-tuning, sampling and reflection, no-load forced zero-, temperature measurement function, need to buy a temperature sensor to 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.