9 Measuring apparatus, instruments, equipment and devices; optical measuring apparatus, instruments, equipment and devices; apparatus, instruments, equipment and devices for checking, measuring and monitoring the dimensions, straightness, ovality, wall thickness, internal and external diameter and circumference, length, bevels, butt mismatch and shape of pipes; apparatus, instruments, equipment and devices for checking and measuring the dimensions of cavities, manholes and sewers and for monitoring the shape of plastics pipes; computer software for all the aforesaid apparatus, instruments, equipment and devices