MMGPS PAVER Can be used with either model of Topcon's Sonic Trackers, listed in the Components section below. 6.3.1 Sign in or sign up for myTopcon to view this page: Sign In Sign Up COMPONENTS GX-60 MC-R3 PZS-MC 3D Paver Junction Box (9432) Dual-Port Paving Slope Sensor (9621) ST-3 Sonic Tracker Sonic Tracker II RELATED PRODUCTS LEGACY Sitelink3D 3D-MC Grade Control Software LZ-T5 DOCUMENTS 3D-MC - Reference Guide 3D-MC - Reference Guide Download