This rotary laser could be useful for both big and small projects. No need to look for a power outlet, since it runs on batteries. Just get at it!
From ManoMano
19157 lar 160 Rotation Laser Set 5 Piece STBLAR160S - Stabila
Conrad Electronic
Stabila LAR 160, 5-pcs 360-degree laser Range (max.): 600 m