Antenna: Receive GNSS signals
Meteorological Sensor: Receive the meteorological data (temperature, pressure and humidity) for atmospheric analysis.
Tilt Sensor: Monitor the verticality of the 5m pillar and detect abnormal shift of the reference station.
Remark:
There is no Tilt Sensor for the roof-top station (HKPC, HKSC, T430, HKTK, HKKS, HKQT, HKCL & HKLM).