http://www.electroscan.com/products/es-38-for-sewer-laterals/

The next generation in sewer leak detection! The ES-38™ is designed for scanning laterals from 3 to 8 inches in diameter. Using Electro Scan's proprietary technology, variations of electricity flowing through the pipe wall, associated with distance measurements, are automatically transmitted to Electro Scan's Smartphone application to record and display defect locations and their relative size.

For more information:
http://www.electroscan.com/contact-us/
(800) 975-6149