Remote level sensing instrument

摘要: Concentrated light beams from two or more sources are passed through a spirit level mounted in portable housing and the presence of beam columns after passing is detected to indicate on-level direction off-level for remote plane surface. In one form, detection circuitry selectably lights pair indicator lamps appropriately arrayed on display panel establishing that orientation out-of-level. The detector can include cross-coupling prevent an erroneous indication another multiple pairs concentrated detectors along length digital converts outputs into direct and/or format useful other data handling equipment.