Hi Target V200 Rtk Gps Gnss Base and Rover Surveying Instrument Gnss Rtk | eBay
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Good Selling Kit Gps Surveying Instrument Gnss Receiver Module Base And Rover Rtk - Theodolites - AliExpress
SparkFun GNSS-RTK Accessory Kit - Includes 1x GNSS Magnetic Mount Antenna 1x Antenna Ground Plate 1x Reversible USB A to USB C Cable 0.8 Meter Cable Length - Designed for The u-blox