Portable Rolling Track Gauge is mainly used for railway track gauge and super-elevation(cant), check rail gauge and back to back distance measurement.It can be used for track inspection and fine adjustment of rail gauge.this product has the advantages of fast measuring speed, stable pushing rod, easy to carry,and night-time and tunnel work,legible even in direct sunlight are supported.It is an ideal measuring tool for track fine-tuning, track construction,inspection and track laying.