The Triplett POE2000 helps to speed up the installation and troubleshooting of PoE system devices. It can detect PSE-type/class, power source, polarity, voltage, current, power, and whether it is End Span (1/2, 3/6), Midspan (4/5, 7/8), or across all 4 pairs. If you are a VoIP phone and IP camera installer, you will know if there is power and a data pair available for your equipment. There is a test mode that can determine if a standard PoE (36 to 60V) or non-standard (11 to 60V) passive PoE is being used. For inline power level monitoring the display alternates between Voltage, Current and Power and incorporates a step button for selecting specific data to display. No batteries required, uses system power when connected to a device.