Techtest Measurement Tools Right Angle 90 Degree Pro Vertical Horizontal Laser Line Projection Square Level Measure Tool Alignment Layout Measuring Beam Light Aligner ( Laser Leveller Yellow One ) Non-magnetic Inclinometer Level  (30 cm)

Specification: Laser wavelength:630-650 nm Laser class:Class II,?1mW power output Anti-dust Anti-water:IP-54 Use Occasion:for floors, tiles, paneling, wall fixtures, wallpapering, stencilling, wainscoting, finish carpentry and more. Accuracy:±3/8" for 100ft.(±1mm/3m ) Self-leveling range:±4 degree Operation temperature: -10~50? Power :3 x AA alkaline batteries(NOT Included) Low voltage indication:Power LED flashing Item Size:120x45x115mm Package Includes: 5 x 90 degree laser level Laser Level Square is an easy to use leveling tool. Projects horizontal and vertical laser "chalk lines" on surfaces. Dual diodes for making 90 degree laser beams on any surfaces. Two suction cups allow the laser level square to be mounted onto the surfaces alignment guide for 90-degree layout-calculate and turning angles in 5-degree increments. Kindly noted: the angle of the laser line can be changed according to the angle scale, saving your time of measurement and marking.