Laser transmitter XT20 can be used to measure flatness and straightness. The laser beam can sweep 360º with a measurement distance of up to 20 metres [66´] in radius. 

Laser transmitter XT22 can be used to measure flatness, straightness, squareness, and parallelism. The laser beam can sweep 360º with a measurement distance of up to 40 metres [132´] in radius.