a try, it will not let you down. Features: Auto MPPT Detection: When pressing the AUTO MPPT test button, the instrument automatically adjusts the test interval time according to the current power value and refreshes the digital display. For example, when the power of solar panel is 100W, refresh once every 5S. Manual MPPT Detection: When pressing the manual MPPT test button, the instrument starts a scan of the maximum power point and refreshes the digital display. Open Circuit Voltage Realtime Display: The open circuit voltage will display on the large LCD screen at any time, giving you a better experience. Large LCD Display with Backlight: The upgraded screen adopts large LCD with backlight, you can turn on or turn off the screen with your like. Multi-protections: over-voltage protects, over-temperature protects, over-current protects and over rated power protects. Wide Applications: This multimeter can be widely used by PV panel manufacturers, PV panel distributors, PV panel installers, PV panel users and PV panel fans. Note: There are two different types of multimeter for you to choose: EL400B/EY800W. The difference between these two types is the power of EL400B is 0.1-400W, the power of EY800W is 5-800W. The current of EL400B is 0-20A and the current of EY800W is 0-35A. Specifications: Material: ABS Type: EL400B/EY800W (optional) Power supplys mode: solar panel power supplys Voltage: 12~60V Power: EL400B: 0.1~400W EY800W: 5-800W Current: EL400B: 0~20A EY800W: 0~35A Item size: 165 * 80 * 30mm / 6.5 * 3.1 * 1.2in Item weight: 470g / 1.0lb Package size: 250 * 130 * 65mm / 9.8 * 5.1 * 2.6in Package weight: 500g / 1.1lb Packing list: 1 * Solar Panel Multimeter 1 * Connecting Cable 1 * Alligator Clip Cable 1 * EVA Toolkit 1 * User Manual