Tilting Level
   Tilting level consist a telescope which enabled for the horizontal rotation as well as rotation about 4 degree in its vertical plane.
   Centering of bubble can be easily done in this type of level. But, for every setup bubble is to be centered with the help of tilting screw.
   The main advantage of tilting level is it is useful when the few observations are to be taken with one setup of level.

Cooke’s Reversible Level
   Cooke’s reversible level is the combination of dumpy level and y-level. In this instrument, the telescope can be reversed without rotation in the instrument. Collimation error can be eliminated in this case because of bubble left and bubble right reading of telescope.