The SKF TraX Wheel End Monitor (WEM) is a device that will help you to detect damages of truck and trailer wheel bearing (raceway spalling) in an early stage.
The TraX WEM is installed at the outboard side of the truck wheel rim. It monitors vibration and changes to an alert mode when measuring vibration created from raceway spalling. From that point in time the WEM will give a warning signal (red flashing light) after being activated.