Wild Heerbrugg described the Distomat DI5S as a small, compact, and highly accurate electronic distance measuring instrument. It had a range of up to 5 km with a 3mm + 2ppm standard deviation, and was designed to fit on any Wild
theodolite in such a manner that it could be fully transiting. The DI5S was introduced in the mid-1980s. The National Imagery and Mapping Agency transferred this example to the Smithsonian in 2000.
Ref: Wild Heerbrugg, DISTOMAT™ DI5S Operator’s Manual (Heerbrugg, 1986).