3M™ Kulemarkør med en utvidet rekkevidde på 1,5 m er spesialdesignet for å lokalisere innfelte anlegg som er dekket av tilbakefylling. Den er festet på undersiden av ikke-metalliske lokk eller deksler over fasiliteter som er montert flush. Denne selvjusterende markøren tilbyr positiv identifikasjon av fasiliteter. I tillegg gjør iD-versjonen det mulig å skrive/lese data inn i/fra markøren.
The 3M™ Marker Balls allow for the easy marking of wastewater lines buried at a distance of 5 feet (1.5 meters)*. Marker balls have a unique self leveling feature, that ensures the marker is oriented to the surface, allowing for an accurate location. Passive marker balls provide accurate identification of buried wastewater lines, helping to reduce the risk of accidently excavating other buried facilities. All markers function without the need for an external power source. Their water resistant polyethylene shells are impervious to minerals, chemicals and the temperature extremes normally found underground. An iD version is available which allows for the storage of customer specific information about the underground asset. *Depth range may vary on "E" (export) models - refer to product specifications.