J.W. Winco Aluminum Bull's-Eye Level for Installation in Plates and Housings, 10mm x 6.9mm (GN2281)

Due to their cylindrical design, GN 2281 bull's-eye levels are suitable for installation in recessed bore holes and housings where they serve to check the horizontal position of jigs, machines and devices. Bull's-eye levels are not aligned, i.e. there is no reference to the external outline of the level. The vertical position must be ensured by aligning the holding/building element. The black housing creates a reflection at the edge of the bubble which significantly improves the readability. Alternatively, the contrast can also be improved by a dark surface inside the mounting bore hole.