1. Static Surveying (Model:H66) 2. Post-differential Surveying (Model: H68) H66/H68 Static GPSProduct FeatureHandy integrated unit, compact and rugged, well sealed for waterproof and dustproofWireless remote control, convenient for smart operationAuto switchable double battery for power supply up to 16 working hoursHigh compactability, capable of working with other brands or even dual-frequency ...