Features 【Solar Panel MPPT Tester】Our solar panel multimeter is designed to detect the voltage, current and power of solar panels and evaluate whether your solar photovoltaic power generation is running well. You can use it to distinguish quality differences between different brands of photovoltaic modules, or find the best angle for solar panel placement. 【Auto/Manual MPPT Test】When the AUTO MPPT test button is pressed, the instrument automatically adjusts the test interval according to the current power value and refreshes the digital display. When the manual MPPT test button is pressed, the instrument starts scanning the maximum power point and refreshes the digital display. 【Open Circuit Voltage Detection】When the VOC test button is pressed, the voltage of the solar panel will be displayed in real time. Suitable for portable solar panels, foldable solar panels, solar photovoltaic modules, car/boat solar, rooftop solar panels, etc. 【Multiple Safety Protections】Multiple protection functions such as overvoltage protection, overtemperature protection, overcurrent protection, and over-rated power protection. Ensure users work safely. 【No Batteries Required】Solar photovoltaic tester, powered by photovoltaic panels, no additional power supply required, just connect the cable to the solar panel and it can work. The large LCD display with backlight allows for clear reading of values under sunlight, making it more convenient to use. Note: Please be sure to disconnect the photovoltaic panel from other equipment or loads before testing. Specification: Material: ABS Model: WS400A/EL400B (optional) Power: 0.1-400W Voltage: 12-60V Current: 0-20A Display mode: LED digital tube display (WS400A)/LCD liquid crystal display (EL400B) Backlight: None (WS400A)/Yes (EL400B) Power supply mode: photovoltaic panel power supply Item size: 165*80*30mm/6.5*3.1*1.2in Packing size: 250*130*65mm/9.8*5.1*2.6in Package weight: 500g Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3mm measuring deviation due to manual measurement. Packing list: 1 x Multimeter 1 x MC-4 connection line 1 x Alligator clip cable 1 x Manual 1 x EVA toolkit Package List