| 摘要 |
The drywall measuring tape is a tape measure extendably contained within a housing, including a laser light source, such as a laser diode, located on each side of the housing. Each laser light source projects a focused light beam perpendicular to the extended tape measure, and in a plane parallel to the housing base. Thus, when the tape measure is extended across a wall with the housing base flush against the wall, one of the laser light sources projects a reference spot onto the ceiling, while the other projects onto the floor. This allows a measurement to be taken horizontally across a wall in reference to a point on the ceiling or floor. Additionally, the drywall measuring tape includes a T-square bracket on the housing base, disposed so that the drywall measuring tape can be quickly aligned with a surface edge for measurement perpendicular to the surface edge.
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