Camber Board Introduction Used to check and maintain the slope of the road as per design. Material Aluminum section of size 24 mm x 45 mm of thick gauge. Size 3 meter, 3.5 meter, 3. 75 meter or as per requirement. Ratio 2.0%, 2.5%, 3.0% or as per requirement. Accessories Highly sensitive magnetic spirit level and seat for it at centre.