Underground Utility Marker Ball – OmniMarker II Safe, Accurate, and Long-Lasting Utility Marking This underground marker ball offers a reliable method for electronically identifying buried utilities. Instead of hazardous liquids or chemicals, it features a large gimballed coil that automatically orients itself horizontally underground. This design ensures a precise detection point directly above the marked location, no matter how it is placed. – Environmentally friendly – no chemicals, no batteries – Passive design – built to last without active components – Detectable up to 5 feet deep using standard frequency marker locators – Produces a clear dipole signal for easy pinpointing – Compact and lightweight, offering strong performance in a smaller form