Spectra Precision GL422N Dual Grade Laser Level, Automatic Self-Leveling with HL760 Receiver, Radio Remote Control, Adapters, Rechargeable Batteries, Charger, Case - Amazon.com
Spectra GL412N Grade Laser Level | Vectors Inc. - Vectors Inc.
Rotation grade laser level GL422N, useful for machine control systems. CALIBRATED!, Laser levellers for Machine Control Systems, Machine control systems for excavators and bulldozers / graders - GeoStar