The ProTrack Power Indicator provides a unique 2 in 1 solution for checking track power on your layout. 
 
Simply lay onto the track for a quick test or solder under the rails as an embeded power indicator.
 
Suitable for gauges 9-28mm (i.e. N, OO9, HOm, OO/HO).
 
Compatible with both DC and DCC. Does not support track ocupancy detection.