Contact rail gauge for METRO measurement The contact rail gauge is a gauge for measuring the parameters of the subway contact rail. Measurement parameters can be customized according to customer requirments,detachable and easy to carry. the main ruler body use high strengthsquare tube aluminum alloy. advantages:precise measurement,new style,reasonable design. Model LJ-JCG-I Vertical Measure range customize Horizontal Measure range customize Accuracy 0.5mm
