The laser horizontal ruler has four functions:

• The laser horizontal ruler can measure whether the plane is uneven or hanging, etc., it can make a straight line
• There are horizontal beads on the laser horizontal ruler, which can measure whether the horizontal plane is horizontal or not, it also has a water bead measuring 45 degrees angle
• Laser level ruler with a circle ruler (2.5m circle ruler with inch scale)
• LV2 laser scales (15cm, 6in) on the edge of the horizontal ruler

Specification: 

• Material: ABS plastic
• Size: L: 160mm, W: 30mm, H: 60mm
• Laser wavelength: 650nm-680nm
• Power supply: AAA battery (not included)
• Net weight: 150g
• Measurement accuracy: 0.01