The instrument has a housing (1) fastened to a vertical surface e.g. tile (4) or room wall (5), by a fastener. A light beam device associated with the housing irradiates a light beam (7) emerging on the vertical surface as a line. A level indicator (8) bri...

A survey setting point indicating device comprises a prism device 5 and a support member, and in the survey setting point indicating device, said prism device comprises a laser emitting device 16 for emitting a laser beam 17, an omnidirectional prism 9 hav...