The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors.
中国还在经纬仪附近发射了气象气球来测量大气温度和压力变化，以更好地估计折射误差。
Geodetic theodolites generally have circles of about 140mm diameter.
大地经纬仪的度盘直径一般为140毫米。
Dynamic Angle measuring system has been employed in electronic theodolites.
