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How to Perform a Two-Peg Test on an Optical Level
Step-by-step guide to the two-peg test for checking optical level collimation error. Setup, rod readings, calculation, and adjustment for Topcon AT-B4, Leica NA724, and Spectra precision levels.
How to Set Up the Spectra Precision LL500 Rotary Laser
Step-by-step setup guide for the Spectra Precision LL500 rotary laser. Tripod setup, receiver pairing, and grade work. Authorized Spectra dealer guide from Express Tools.
How to Use an Optical Level for Differential Leveling
Step-by-step guide to differential leveling with an optical level. HI method, turning points, closing the loop, and error tolerance for Topcon AT-B4, Leica NA724, and Spectra precision levels.

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