The ST500PGN puts a high magnitude pulse between the neutral/hotleg or hotleg/hotleg for any secondary service(120V,208,277,480V). It cannot be fooled by telephone and cable television bonding often missed by continuous loading devices. 500 Amps.The ST500PGN can perform the following functions: Identify bad conductor(s) from the transformer to the meter base Indicate integrity of neutral conductor to prevent excessive house-ground currents Locate both hot legs and neutral at the pedestal and/or transformer blocks. Locate bad connectors on overhead spans Identify de-energized URD Primary cable in a manhole or ditch A 6-month pilot project was conducted at a Major Investor owned Utility where the ST500 was found to save the Utility time and money while improving their Customer Satisfaction Rating.Includes: 500 amp service tester Receiver probe Laser pyrometer Current limiter adapter Alligator clip cable Standard wall socket cable 10 inch handle Manual Standard bag