GRADEMETRIX® SCRAPER SITE CONTROL & GUIDANCE POSITIONING SYSTEM GradeMetrix® Scaper is packed with industry-lead- ing technology. It is easy to use and delivered at an affordable price. The system can be installed and calibrated in less than 8 hours. GradeMetrix® Scaper uses a VR1000 single antenna but can be scaled up to dual GNSS antenna solution for improved accuracy. The GradeMetrix® system is designed to fit seamlessly into your existing site infrastructure using all the same design file formats and base station corrections. To ensure your peace of mind, all major components are covered by our best-in-class 3-year warranty.