NanoSonde MPL4-33 is Vesalas new, worlds tiniest active sonde for small underground ducts. It is only 4.6 mm in diameter so it is optimal for calibrating 6 mm (inner diameter) fiber optic ducts and to locate their blockages, dents and other problems. MPL4-33 is flexible in the middle so it can navigate tight duct curves down to 170 mm radius.

MPL4-33 is intended to be used with the Vesala CL43 Compact Locator and other cable tracers and pipe locators working on the 33 kHz tracing frequency.

Battery included as standard. Replacement batteries available here