Laser wavelength: 660nm Laser Class: Class II Protection class: IP54 Indoor distance: less than equal 10m Accuracy: ±0.5°<br><br>LI1 is an angle meter for home or office use, not a special level meter on the market. The laser line casting does not have the automatic leveling function. The casting line has an angle error. Product name:LI1 Laser Protractor Battery: 730mAh Rechargeable Working mode: absolute angle + relative angle Colour:As Shown Material:Plastic+Metal<br><br>Package Contents: 1 * LI1 Laser Protractor 1 * support<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.