Radiodetection S9 MiniSonde (33 kHz) The Radiodetection S9 MiniSonde (33 kHz) is a compact, self-contained transmitter designed for locating non-metallic underground pipes, ducts, and conduits in confined or hard-to-reach environments. Operating at 33 kHz , the S9 MiniSonde delivers a strong, reliable signal that is easy to detect with compatible Radiodetection locators, with a typical locate depth of up to 10 ft (3 m) . With a slim 9 mm diameter and compact form factor, the S9 MiniSonde is ideal for use in small-diameter ducts, drain lines, and conduits where larger sondes cannot pass. Its self-contained, battery-powered design eliminates the need for external wiring, simplifying setup and operation in the field. The S9 MiniSonde is supplied as a complete kit, including batteries and a protective storage case , making it ready for immediate use and easy to transport between job sites. Part Number: 10/SONDE-MINI-33 Key Features 33 kHz transmit frequency for strong signal detection Locatable to depths up to 10 ft (3 m) Compact mini sonde design for small-diameter pipes and conduits Self-contained, battery-operated transmitter 9 mm diameter for use in tight or restricted spaces Compatible with Radiodetection precision locators Supplied as a kit with sonde, 2 batteries and protective case Reliable signal for accurate locating of non-metallic utilities Ideal For Utility locating professionals, drainage and plumbing contractors, telecom installers, and municipal crews tracing small, non-conductive pipes, ducts, and conduits in narrow, confined, or shallow underground environments.