A level is a core tool used in construction, decoration, mechanical installation, and other fields to detect the levelness or verticality of a plane. Proper use can significantly improve construction accuracy. Currently, mainstream levels are divided into traditional bubble levels and modern laser levels. The operation logic of both is similar, but laser levels are more suitable for large - area operations.

Before use, basic preparations should be made. First, check the status of the equipment. For a bubble level, ensure that the glass tube is not damaged and the bubble is clear. For a laser level, confirm that the battery is fully charged and the laser head is not blocked. When placing, choose a stable base surface. If operating on an uneven ground, adjust the height of the bracket to make the instrument roughly level first.

The core operation steps are divided into three parts. The first step is positioning. Attach the level tightly to the surface of the measured object. For a bubble level, ensure that the measuring surface is completely attached to the measured surface. For a laser level, aim at the reference point of the operation area. The second step is reading. For a bubble level, observe the position of the bubble in the glass tube. When the bubble is in the center, it indicates levelness or verticality. For a laser level, after turning it on, the projected laser line is the reference line, which can be directly used as a construction reference. The third step is review. To avoid errors, measure at different positions of the measured object multiple times. Especially in large - area wall leveling or equipment installation, at least 3 different measuring points should be selected to verify consistency.