LT-202激光电子经纬仪是一款集多种功能于一体的高精度测量仪器。它基于DT200系列电子经纬仪改进而成，增加了激光发射系统，激光波长为635nm。该仪器的激光束与望远镜照准轴同轴、同焦，不仅具备传统电子经纬仪的全部功能，还能提供一条可见的激光束，便于工程施工。

其电子经纬仪部分采用光栅增量式数字角度测量系统，结合微型计算机技术，可实现测量、计算、显示和存储等多项功能。它适用于多种高精度测量场景，如大型船舶制造、中小型水坝坝体位移测量、重型机器校正、港口桥梁工程、大型管道铺设、隧道井巷工程、高层建筑施工等。

LT-202的望远镜配备40mm物镜孔径和30倍放大倍率，视场角为1°20′，最短视距为1.3米。激光发射系统在白天的有效射程可达200米，光斑大小为5mm/100m。此外，该仪器还配备自动垂直补偿器和双面显示屏，方便操作和读数。

The LT-202 Laser Electronic Theodolite is a multifunctional, high-precision surveying instrument. Based on the DT200 series electronic theodolite, it has been enhanced with a laser emission system featuring a wavelength of 635nm. The laser beam is coaxial and confocal with the telescope s sighting axis, providing a visible laser beam in addition to the traditional functions of an electronic theodolite, which is particularly beneficial for construction engineering.

The electronic theodolite part utilizes a grating incremental digital angle measurement system and is integrated with microcomputer technology to perform measurement, calculation, display, and storage functions. It is suitable for various high-precision measurement scenarios, such as the manufacturing of large ships, displacement measurement of medium and small dam bodies, correction of heavy machinery, port and bridge engineering, laying of large pipelines, tunnel and adit engineering, high-rise building construction, and more.

The telescope of the LT-202 features a 40mm objective lens aperture and 30x magnification, with a field of view of 1°20′ and a minimum sighting distance of 1.3 meters. The laser emission system has an effective range of up to 200 meters in daylight, with a spot size of 5mm/100m. Additionally, the instrument is equipped with an automatic vertical compensator and a dual-sided display for convenient operation and reading.