Bubble level
laser level
spirit level
Perpendicular
You can check the tilt of the floor. 3 in 1 water level meter
You can check if you have installed a photo editor.
You can use the camera to measure the tilt of the house.
And many more can use this tool.
9Apps 4.9
![국세청 홈택스 [손택스] on 9Apps](https://sg-res.9appsdownloading.com/sg/res/jpg/f7/df/69cc2f90120ec331db2630e0f5b6-6dh.jpg?x-oss-process=style/jmq200)
