L Shape Ruler Measuring Track to Basemark L-shaped track ruler is a special measuring tool used for measuring the distance between the inner side of railway track and the base mark and the height between the plane on the rail and the base mark. 1. Accurate measurement:keep long-term stability. 2. Easy operate 3. Insulated design Model:TLC-I Type:Fixed Point Measuring Gauge Material:Aluminum alloy Dimensions (L x W x H) (mm):1000*140*100mm Length:1000 mm Horizontal measuring range:200-9000mm Vertical measuring range:50~-800 mm Score error:±1mm Level indicater:bubble