Patent ID: 8220171
Filing Date: 2012-07-17
Classification: G01C

Abstract:
1. A spirit level for placing on a generally horizontal surface for providing a visually intensified indication of the inclination of the generally horizontal surface relative to the horizontal, the level comprising: (a) a main body having a longitudinal axis, a front major surface, a rear major surface, a left end, a right end, and a leveling surface for placing on the generally horizontal surface, (b) a horizontal bubble vial mounted lengthwise in said main body and having a longitudinal axis parallel to said leveling surface, (c) a coloring agent at least partially disposed in an upper half of said rear upper quadrant in said transverse cross section in close proximity with said central region such that, on placing the spirit level on the generally horizontal surface, a user sighting said bubble vial along a direct line of sight bounded between said top plan view and said front elevation view perceives said bubble surface as being colored by said coloring agent thereby improving bubble visibility for assisting user readability for leveling purposes.