The L-703SP System is 30-40% faster than electronic levels, more rugged and reliable, and more repeatable from one tech to the next. In addition, the L-703SP is set up directly on surface plates, so each line segment setup is much easier than autocollimators and laser interferometers, which require floor mounting and touchy setups. This results in 50-60% faster plate calibrations and, unlike these devices, does not require re-taking data if the laser beam is broken.