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When knocking in something with a hammer, it’s difficult for people to find out the horizontal line without hinting
by others. As a result, the things knocked in the wall are often not consistent in height. 0° Hummer is a hammer
which can assist the user to find out the horizontal line and the vertical line. When people have knocked
first nail in the wall, they can put the bottom of the hammer against the wall to trigger the
switch on the bottom,
thus radiating a ray vertical to the horizontal line on the wall.
Users can confirm the position of the next nail
by relying on the position of the first
nail shone by the ray.
Dalian Minzu University