Features 1、On a surface emitting straight line, a straight line can be in any angle. Can be single, double operating at a 90 degree angle. 2、Suitable for carpentry, stair starting boards, shelves, molding, laying tile or any other job requires precise alignment. 3、It maintains the original characteristics of rectangular device, while the output of two extended 90° right angle laser chalk line, can significantly extend the length of the rectangular device. 4、Protractor scale can be changed depending on the angle of the reticle, saving protractor and marking time, is an effective tool. 5、With two suction cups, suction cup can only be used on a smooth surface, such as glass, ceramic tile. 90 high‑accuracy level meter, designed for 90 stickers tiles. Specification Item Type: Levelling Instrument Material: ABS Color: As shown in the picture Measuring Range: 650mm Measurement Accuracy: 2-3mm Graduation Value: 2-3mm Resolution Value: 2-3mm Application: Any place Battery: 3 x AA batteries (Not included) Battery Voltage: 1.5V How to Use It can be used when the battery is installed and the switch is turned on, and the operation is simple. Package List 1 x Levelling Instrument(Battery Not Included)