3M Scotchmark Ball Marker
The unit is buried directly over key underground locations. It can be located using a 3M EMS II Marker Locator that transmits a signal to the buried marker. The marker's location is indicated with both a visual meter reading and an audible tone. The unit has a range of up to four ft from marker to locator. The width allows the marker to be placed in a standard four-in. trench without additional digging and it cannot be inadvertently removed, or worn away by weather.
This system can be used in congested areas and is not affected by metal conduit or pipe, metallic conductors, fences, or AC power. Each marker is tuned to a specific frequency for the individual utility, and the locator is preset only to that frequency.
<%=company%>, 6801 River Place Blvd A130-3N-54, Austin, TX 78726-9000; phone: 800-722-6721; fax: 800-828-9329