Truing up walls can be especially tricky using even a plate-to-plate level. This makes using a laser plumb bob a lot easier. The 2″ offset from the front and sides allows the unit to be placed in a corner and both walls trued up. And the target can easily be seen by several people making truing up walls a task for a ‘team’. The red target reflects the laser dot and makes this very usable in even bright sunshine.
See my Habitat Tool Tip page for more: http://www.johnrlee.com/HabitatToolTips/HabitatToolTips.htm