360 °帮手 / 360°Helper

360°Helper helps people solve all problems concerning symmetry when working on walls such as driving nails into the walls, hanging frames and pasting posters. It can project the red rays on the walls with red dots with equal in-between distances. The users can rotate the rays at any angle while adjusting the in-between distances to meet all possible needs so that people find it easy to engage in work about symmetry on the walls.