The 3M spherical marker for depths up to 1.5 meters, model EMS 1401-XR, is a reliable tool for marking underground telephone lines. Designed to allow easy and precise location of these lines at depths of up to 1.5 meters, spherical markers feature a unique self-leveling mechanism that ensures the marker is always properly oriented relative to the surface terrain, providing accurate location results.

These passive spherical markers provide precise identification of underground telephone lines, significantly reducing the risk of accidental damage to other buried installations. Additionally, all markers operate without the need for external power, making them easy to use and reliable in operation.

Made of waterproof polyethylene, the marker covers are resistant to the effects of mineral substances, chemicals, and extreme temperatures often encountered underground. Also available is a version with an identifier (ID) that allows storage of information about specific underground objects, facilitating management of the telecommunications infrastructure.