The 3M™ EMS Ball Markers have a self levelling design providing accurate, horizontal position regardless of how the ball is placed in the ground, making the job of precisely locating underground facilities easier.
3M™ EMS Extended Range Ball Marker provides an effective way of marking underground facility lines. It withstands a temperature range of 20 to 50 °). 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.