Description Adopts an intuitive LCD display screen for you to see the data more clearly, and with three modes for you to switch freely: POE mode, digital mode and analog mode.POE test function: This tool can be used to test both standard and non-standard POE devices, it can also test POE voltage, polarity of power supplies and mode of power supplies.Voltage test function: You can click V to enter voltage test function, which can measure battery voltage and voltage polarity and you can press V again to enter POE test mode. You can measure the line and voltage of POE power supplies.Sensitivity adjustable: when the receiving signal is strong, turn down the sound volume; when the receiving signal is weak, increase the volume of the sound, which allows you to get more accurate test data.With the LED flashlight function, you can turn on the flashlight when the light is dim or when you use it at night, so you can use it normally in dark environment.