3M Scotchmark Ball Marker

3M Corrosion Protection Productschmark Electronic Marker System (EMS) Ball Marker features a self-leveling feature incorporated to eliminate inaccurate location readings. The system is designed to ignore backfill dirt and can be installed simply by tossing the ball into the crack. It contains a passive-tuned antenna, molded inside a plastic disk, which is free-floating inside a water-resistant polyethylene shell. The shell is engineered to be impervious to minerals, chemicals and temperature extremes normally found in underground plant environments.

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.

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