Spectra Laser Level LL500 with HL700 ReceiverThe Spectra Precision LL500 Auto Laser Level with HLL700 Receiver by Trimble is a one person leveling system designed for longer range measurements across your entire site. Accurate, stable and reliable, the LL500 features a 500m working diameter which increases productivity by reducing the need for multiple setups on a large job site. The rugged LL500 is self leveling with built in "out of level" shutoff that maintains accuracy over the entire work