Abstract: A combined laser, level, and tape measure has a magnetic edge for attaching to metal fence posts for use in obtaining accurate measurements of the drop and gait needed for constructing a fence on a sloping terrain. It is configured with the laser emitter on the top for generating a laser beam perpendicular to the fist post along which the device is moved to align the laser beam with the ground point at a second post spaced apart from the first at a higher elevation. A measuring tape positioned baselined to the laser and positioned at the bottom of the device is drawn down to measure the distance from the laser beam to the ground, which is equal to the drop in elevation between the two posts.