The contact rail measuring ruler, also known as the third rail ruler, is a specialized measuring tool used to measure the contact rail height (the vertical distance from the contact rail to the horizontal plane of the track) and the pull-out value (the horizontal distance from the contact rail to the inner side of the adjacent track) in rail transit systems. 

Main Technical Parameters:

The horizontal distance from the inner side of the contact rail to the inner edge of the adjacent running rail is: (  ) mm ± (  ) mm

The vertical distance from the lower rail surface of the contact rail to the top surface of the running rail is: (  ) mm ± (  ) mm     

Note: The above (__) data are provided by the custom product user.