TRIMBLE has unveiled the GL412 and GL422 grade lasers. The lasers can perform three types of jobs for the construction contractors – level, grade and provide vertical alignment with plumb. The Spectra Precision GL412 (single grade) and GL422 (dual grade) lasers offer horizontal level, grade and vertical plumb setup with no manual levelling. The GL412 and GL422 grade lasers send a continuous, self-leveled 360° laser reference over an entire work area, and feature a wide grade range of -10 to +15 per cent, so they can be used for a range of slope applications. These extremely rugged lasers can withstand a drop of up to 1m directly onto concrete to reduce service costs. Both lasers feature a two-way full-function remote control with built-in backlit grade display. This allows the contractor to do everything with the remote control they can do at the laser keypad, including grade reverse on both axes, up to 100m away from the laser – even from the cab of the machine. The ability to make grade changes from anywhere on the job reduces setup time and speeds operation, especially when multiple job grade breaks are needed. Additionally, the GL412 and GL422 self-plumb in the vertical position to accommodate applications, such as anchor bolt installation, plus form, tilt up and curtain wall plumbing. Both units also incorporate automatic temperature and grade compensation for high accuracy in any weather or geographical location and no rework. On both models, the laser beam can be turned off electronically on up to three optional sides. This capability eliminates interference with other crews on the job site by keeping the beam from straying into other work areas. Trimble ’s GL412 and GL422 lasers can be used with a Spectra Precision HR550 laser receiver at an operating diameter up to 800m or with the Spectra Precision CR600 laser.
Source: Construction Contractor