Elejoy EY800W 800W Solar Panel Power Supply Multimeter 1. 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. 2. 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. 3. Open circuit voltage realtime display: the open circuit voltage will display on the large LCD screen at any time, giving you a better experience. 4. 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. 5. Multi-protections: over-voltage protects, over-temperature protects, over-current protects and over-rated power protects. 6. 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.