WS400A  This solar panel multimeter can test the maximum power point and open circuit voltage of photovoltaic panel, also using the photovoltaic panel to supplys power. With the portable design, easy to hold. Come on and try it, 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, when the power is 300W, refresh once every 15S. 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 detection: When pressing the VOC test button, the voltage of solar panel will displayed in real time. Multi-protections: over-voltage pro-tection, over-temperature pro-tection, over-current pro-tection and over rated power pro-tection. Photovoltaic panel power supplys mode, no additional power supplys required, easy to use. Specifications: Material: ABS Power supplys mode: solar panel power supplys Power: 0.1~400W Voltage: 12~60V Current: 0~20A Item size: 165 * 80 * 30mm / 6.5 * 3.1 * 1.2in Item weight: 436g / 1.0lb Package size: 250 * 130 * 65mm / 9.8 * 5.1 * 2.6in Package weight: 500g / 1.1lb Packing list: 1 * Multimeter 1 * MC-4 Connecting Cable 1 * Alligator Clip Cable 1 * User Manual 1 * EVA Toolkit      EL400B/EY800W          This solar panel multimeter can test the maximum power point and open circuit voltage of photovoltaic panel. The photovoltaic panel power supplys method is more energy-saving and does not require additional electricity. If you are looking for this product, come and have 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.