Are the Worksurface Patterns Visible through BullseyeBore rotation? 

Yes, the worksurface patterns produced by BullseyeBore when viewed through BullseyeBore rotation are visible. However, the patterns may be partially obstructed when the front of BullseyeBore comes within one inch of the work surface. Moreover, the rotational speed of the drill can impact worksurface pattern visibility, especially when the front of BullseyeBore comes within one inch of the worksurface. The best way to avoid any work surface pattern obstruction is to position your view above, below, or to the side of the drill and not directly behind it. Alternatively, you can simply use a longer drill bit for the given drilling operation.

Caution should also be exercised when drilling vertically into a ceiling or similar structure. If you are positioned below the drill, and the ceiling or structure can generate a lot of debris during drilling, the debris can fully or partially obstruct the BullseyeBore Core optical window and thus block the laser projections on the work surface. For example, drilling into a drywalled ceiling can generate a lot of dust and debris and obstruct the BullseyeBore Core optical window.

As a general guide, if you plan to use BullseyeBore Core indoors and battery life is important, select the Core Red versions CR1-100 and CR1-101. Conversely, if you intend to use BullseyeBore Core in bright indoor conditions or indirect sunlight, choose the Core Green versions CG1-100 and CG1-101.