We, TIANJIN SETL SURVEY EQUIPMENT CO., LTD., was founded in 1992, is one of the biggest manufacturer of surveying instruments and accessories in China. We are awarded the certificate of ISO9001:2000. Since 1997, we developed various kinds of new products. Such as several kinds of auto levels, cross line lasers, theodolites, tribrach, tribrach adaptor, tripods, staves and so on. With our products being put into market, we have obtained great development during the past several years. Now we became the OEM manufacturer for the well-known companies in the world and obtained good public praise all over the world.