Radiodetection S13 Sonde — Small Conduit & Duct Sonde (13 mm) The Radiodetection S13 Sonde is an ultra-compact transmitter designed for locating and tracing non-metallic pipes, ducts, sewers, and drains in very small or narrow spaces. With a slim ½ in (13 mm) diameter , the S13 is ideal for use in tight conduits where standard sondes cannot fit. Engineered for precision, the S13 Super Small Sonde helps technicians trace underground routes and accurately locate blockages, collapses, and obstructions . Its compact design makes it well suited for insertion into push rods, inspection tools, and confined-access systems. Key Features Ultra-compact 13 mm (½ in) diameter Designed for narrow ducts and small conduits Ideal for tracing non-metallic pipes, sewers, and drains Supports precise location of blockages and collapses Self-contained sonde design for confined environments Ideal For Utility locators, drain and sewer contractors, CCTV inspection crews, and maintenance teams working in small-diameter conduits and tight-access underground systems.