T2经纬仪 苏一光与瑞士合资生产，数量有限。质量好，价格适中。技术参数 一测回水平方向标准偏差（按DIN18723）                     0.8"（0.25mgon） 望眼镜                                        正象    放大率                                    30ⅹ    物镜有效通过口径               40mm    1000m处视场直径                   29m    最短视距                                 2.2m    视距乘常数                             1000    视距加常数                                   0 水准器灵敏度    圆水准器                              8´/2mm    照准部长水准器               20"/2mm 竖盘指标自动归零补偿器                       安置精度                              ±0.3"  工作范围                            ±0.5´ 玻璃度盘          360°(400gon)  水平度盘分划直径       90mm  竖盘度盘分划直径       70mm     度盘最小分划间隔        20´（0.2gon） 光学测微器最小分划间隔   1"(0.1mgon) 光学对点器（在基座上）            正象     放大率                                         2ⅹ  调焦范围             0.3m至∞                          （1.1ft至∞）