Compared with other high-performance measuring instruments, the price of bubble level is relatively affordable. This makes it the preferred measurement tool for many industries and individual users. The maintenance of bubble level is relatively simple, without the need for complex maintenance procedures and expensive maintenance costs. This further reduces its usage cost and improves its cost-effectiveness. Bubble level gauges are usually made of high-quality materials and processes, and have high durability. Under normal use, it has a long service life and can meet the needs of long-term use.

The working principle of the bubble level is based on the surface tension and gravity of the liquid. When the bubble level is placed on the surface to be measured, the liquid will be evenly distributed between two disks, and the bubbles will move to the highest point of the liquid, which is the horizontal position. If the surface is not horizontal, the bubble will deviate from the central position due to gravity, and the surface's levelness can be determined by observing the position of the bubble.