Direct Answer
The Spectra Precision DG813 is the best grade laser for site prep — dual-grade X and Y simultaneously, 800m working range, machine control compatibility, and a wireless remote that works from the cab. For single-direction slope work at a lower price, the Topcon RL-200 1S is the standard value choice.
Site prep grade control requires more than a flat horizontal reference. Most site preparation work involves establishing design slopes — parking lot crowns, drainage swales, road subgrade, and building pad perimeter slopes all require a reference plane at a specific angle. A grade laser provides that sloped reference, allowing machine operators and rod persons to work to design grade without manual slope calculation.
Use the Sitemark grade calculator to check design slopes and verify your grade laser is set correctly before beginning earthwork.
The benchmark grade laser for site prep. Dual-grade with X and Y axis control, 800m range, machine control compatibility, and a remote control that works from the excavator cab or grader seat.
Single-axis grade laser for site prep where slope is applied in one direction. Lower cost than dual-grade instruments with the same long range and outdoor ruggedness needed on large sites.
IP67-rated dual-grade laser built for the most demanding outdoor site prep environments. Best choice when the instrument will face extreme dust, mud, and vibration from heavy equipment.
Spectra, Topcon, and Leica grade lasers for site prep contractors.
Shop at Express Tools ↗Log grade shots, verify design slopes, and generate as-built documentation for owner and inspector.
Start free with Sitemark →How grading and site prep crews use Sitemark to document field work.
The Spectra Precision DG813 is the most popular grade laser for site prep — dual-grade X and Y, 800m range, machine control compatible, and wireless remote. For single-direction slope work, the Topcon RL-200 1S is a more affordable alternative.
A grade laser projects a reference plane at a programmable slope angle, while a rotary laser projects only a flat horizontal plane. For site prep involving sloped surfaces — parking lots, drainage, road subgrade — a grade laser is required. For flat pad work, a standard rotary laser is sufficient.
Yes. Grade lasers like the Spectra DG813 are compatible with machine control systems. The machine control receiver (mounted on the blade or bucket) reads the laser plane and the system automatically adjusts to maintain design grade. Confirm receiver compatibility with your machine control manufacturer.