Portable Rolling Track Gauge is mainly used for railway track gauge and super-elevation (cant) . 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. 1. Measure the track gauge, cant without bend over your back. 2. Light weight : around 6.5kg , one person operation. 3. Bluetooth connection, data uploading and analysis system. 4. High working efficiency. Save your man power. ( 1 man with 1 rolling gauge = 4 man with 4 normal digital track gauge)