3M EMS Extended Range Ball Marker provides an effective way of marking underground facility lines. It withstands a temperature range of 4 to 122 °F ( 20 to 50 °C). This passive underground marker with a water resistant polyethylene shell does not react with any chemicals or minerals. This ball marker effectively operates without the need for any external power source.

• Self-leveling design for precise and horizontal positioning
• Offers easy marking of buried power lines
• Passive antenna encased in water-resistant polyethylene shell
• Withstands a temperature range of -4 to 122 °F (-20 to 50 °C)
• Works without any external power source