The CT601 small crawler from Cobra Technologies from Trio Vision has brass construction that makes it a hardy performer for its size without adding undue weight. It can be configured with a powered camera lift and accessory wheels, making the system capable of inspecting 30-plus-inch lines. It can be paired with the Cobra PTZ Version 9 Camera that is rated from 6 to 48 inches. 800/443-3761; www.cobratec.com.