Digital Track Gauge is a special design for global market. It is used for measuring the track gauge, check rail gauge, back to back distance, Cant(super-elevation) and flangeway clearance.he strong temperature compensation function eliminates the influence of temperature expansion and cold contraction on the measured values’accuracy.This guarantees the device can work normally at -30~+55 degrees. GJC-TJG Series also obtain CE Certification and CRCC Approval.