p This track tester works on OO HO & N Gauge track & enables you to quickly test track for DCC or DC power as well as also helping you to locate faults at track joints points etc To use simply place it across your track & the multicoloured LED will either display Orange for DCC power or Red & Green for DC power with the colour indicating the positive or negative The polarity or train direction of the rails is shown on the productppa hrefinstructions GM52 Instructionspdf Click Herea to view the instructions for this productp