The main part of the wheel tread is an inward inclination of 1:40 . In order to make the top of the rail track under the wheel load with cone tread stressed uniformly ,decrease load offset, reduce rail web stress , avoid slit between rail head and rail web, the railway track shall not be laid upright for straight line, it shall be inward inclined ,this inward inclination of rail called Rail Cant, it is a high precision ,portable , numeric rail geometrical testing tool. BENEFITS: 1.Stable performance ,protect electromagnetic interference . 2.One piece structure design ,light and handy ; 3.magnetic self-absorption function ; 4.Data display is clear and intuitive 5.The function of temperature of environmental temperature factors on the measurement data 6.Power saving function :The system will shutdown automatically if there is no operation in 5 minutes . Model:JG-SO1 Power Supply Mode: Built-in lithium battery charging Operating Temperature:-30° +60° Measuring Range:±110 ±1200 Operating Current:40mA Size:225*90*60mm