技术指标：                              
望远镜
      有效孔径                           45mm
      放大倍率                           30×
      成像                               正像
      视场角                             1°30′
      最短视距                           1.5m
测距部
      测程
        单棱镜（在良好气象条件下）
                                         BTS-812A --2.0km
                                         BTS-812 ----1.3km
                                         BTS-815 ----1.3km
        三棱镜（在良好气象条件下）
                                         BTS-812A ---3.0km
                                         BTS-812 -----2.0km
                                         BTS-815 -----2.0km
测量精度  
                                       BTS-812A ---±(2mm 2ppm•D)
                                       BTS-812 --- ±(3mm 2ppm•D)  
                                       BTS-815 --- ±(3mm 2ppm•D)
      最小读数