Theodolite has several instruments with different precision, such as DJ07, DJ07, DJ 1, DJ2,. D 16+06, etc. "D" and "J" stand for the first letter of the Chinese phonetic alphabet of "Dadi" respectively. Theodolite ",and" 07 ","1 ","2 "and" 6 "are seconds indicating the direction observation error of such instruments. Usually, the letter "d" is omitted when writing. Theodolite models J07, J 1 and 12 belong to precision theodolite, while theodolite model Js belongs to ordinary theodolite. In building engineering, the commonly used optical theodolite is 12 and Js.

The model codes of DJ- theodolite mainly include DJ05, DJl, DJ2, etc.