This USB meter can test voltage， current， power and capacity at the same time and display on the white OLED screen. It features over/under-voltage alarm function and screen rotation function.   <br><br><strong>​Features:</strong> <br>White OLED display， clear for readings. <br>Test voltage， current， capacity， powerat the same time(USB3.0 can also test energy). <br>Three modes for selection: direct mode， quick charge mode and disconnected mode. <br>9 sets of data can be maintained(only USB 3.0 model). <br>USB 3.0 only: capacity stored function， capacity unit switch， and shut-down screen function. <br>With over/under-voltage alarm function and screen rotation function. <br>Support QC2.0 high pass quick charging. <br>Suitable for digital products， such as mobile phones， power bank， tablet， camera， etc. <br><br><strong>Specifications:</strong> <br>Display: 0.91" 128*32 White OLED <br>USB Interface: USB 2.0 / USB 3.0 (Optional) <br>Voltage Range: DC 3.7-13V  <br>Accuracy: USB 2.0: (+/-)0.3%+1dgt; USB 3.0: (+/-)0.2%+1dgt <br>Current Range: DC 0-3A <br>Accuracy: USB 2.0: (+/-)0.5%+2dgt; USB 3.0: (+/-)0.8%+3dgt <br>Power Range: 0-39W <br>Capacity Range: 0-99999mAh， Resolution: 1mAh <br>Energy Range(USB 3.0 ONLY): 0-99999mWh-999Wh， Resolution: 1mWh <br>Update Rate: 2 times/s <br>Static Power Consumption: About 10mA <br>Item Size: 64 * 22 * 11mm / 2.52 * 0.86 * 0.43in <br>Item Weight: 14g / 0.5oz <br>Box Size: SUB 2.0: 9.5 * 4.5 * 2cm; USB 3.0: 9 * 6 * 2.2cm <br>Package Weight: USB 2.0: 27g / 0.98oz; USB 3.0: 44g / 1.57oz <br><br><strong>Package List:</strong> <br>1 * OLED USB Power Meter <br>1 * Srotage Box <br>1 * User Manual (English)