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We have 2 Spectra Precision GL422N manuals available for free PDF download: User Manual, Handy Tips & Advice. Spectra Precision GL422N User Manual (31 pages). The Spectra Precision. ®. Laser GL412 (single grade). and GL422 (dual grade) transmitters are cost- effective, automatic self-leveling lasers that do The GL412 Grade Laser (single grade) and GL422 Grade Laser (dual grade) lasers send a continuous, Overview; Features & Benefits; User Guide; Datasheet Spectra Precision GL422 Grade Laser manuals and user guides for free. Read online or download in PDF without registration.View the GI422 User Manual for the Trimble model GL4XX Lazer Level System PWRGL4XX. View the PDF file for free. GL422 User Manual. Lazer Level System Thank you for choosing one of the Spectra Precision Lasers from the Trimble For hazardless and safe operation, read all the user guide instructions. Spectra Precision GL422 instruction manual and user guide. Rotary Laser Level with HL760 Laser Receiver Self-Leveling Horizontal and Vertical Dual Grade.