The ST400 is mounted to the blade and uses a physical reference such as curb and gutter, stringline, existing or previous pass as an elevation reference.

When improved vertical accuracy is needed, GNSS systems can be enhanced with the Trimble SR300 Laser Receiver Mast with a GNSS Smart Antenna for blade control to 3-6 mm.

The Trimble LR410 Laser Receiver delivers lift accuracy of 3–6 mm, making it one of the most reliable machine control components for earthmoving and grading. With 360° laser detection, rugged weatherproof housing, and seamless integration into Trimble GCS systems, the LR410 ensures construction professionals achieve accuracy, productivity, and reliability on any site.

Spectra Precision Laser GL700 series Series Grade Lasers provide years of durable, precise machine guidance with GCS900 2D Grade Control Systems, the GCSFlex Grade Control Systems and laser-based compact machine installations.