The Spectra DET-2 Digital Transit offers the professional contractor the best solution for all angle and alignment needs. The DET-2 features 5 angular accuracy with a vertical tilt sensor that compensates telescope transiting to allow for instrument set up accuracy. When Projecting a line or plumbing columns or walls, the DET-2 will state to user the actual variance in true plumb and allow user to accurately and quickly turn the instrument back to a plumb position.